Issue with very slow DNS lookup. SBS 2008 R2.

(Preface: sorry if this is the wrong forum...new at this! X-posted from Reddit)
I'm stumped with this one. Last week, the server installed a few updates, no problem, a handful of security stuff. Since then, I've been having issues with DNS lookups on every computer on the network. It will hang on "looking up <domain>.com..."
and then after 20-30 seconds, it will show a "can't find the server" error. BUT THEN! When you click try again, it loads right up. And then it works fine. For a day or so. Then, the next day, or maybe just a few hours later, sometimes while browsing
the same site, it will do the same thing. It's like the DNS server just forgets the lookups it's already done after a time.
Things I've tried:
restarting server (duh)
rolling back updates
reinstalling said updates
restarting all network hardware from the gateway outwards
restarting the service itself while the server is running
The only thing the event log shows is a single error during startup - event ID 4015. The text reads:
"The DNS server has encountered a critical error from the Active Directory. Check that the Active Directory is functioning properly. The extended error debug information (which may be empty) is ' '."
This error has only occurred once that I saw and did not occur on the most recent startup, but the issue is still present
Active directory seems to be fine. No errors or warnings in it and no info from the event log is showing anything that seems to be helpful.
I've looked around the KB but every article seems to be troubleshooting a much more specific problem or a different problem altogether, such as a misnamed, stuck, or incorrect DNS zone, or a DNS lookup that fails to complete altogether.

Hi Craigglesofdoom,
Would you please let us know current situation of this issue? Did you refer to above suggestions and solve this problem? If any update, please feel free to let us know.
Please also run SBS BPA tool and check if find relevant issues.
For Event ID 4015, please refer to following article and check if can help you.
Event ID 4015 — DNS Server Active Directory Integration
-->The DNS server has encountered a critical error from the Active Directory. Check that the Active Directory is functioning properly.
Please use dcdiag command-line tool. Any find?
Domain Controller Diagnostics Tool (dcdiag.exe)
Dcdiag for DNS: Test details explained
Hope this helps.
Best regards,
Justin Gu
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact [email protected]

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For anyone who is experiencing slow DNS lookups...

I finally worked out what was wrong with my network config last night and thought I'd share it with everyone in a simgle post in the hope it'll help someone else.
I tried the BIND work around, but it wasn't all that much faster.
I tried disabling IPv6, but that didn't do much...
The solution?
In 'System Preferences' -> 'Network'
Go to configure the adaptor (Airport / Ethernet / etc)
In 'DNS Servers' where you'd normally specify the DNS servers given to you by your ISP... don't do this! As crazy as it sounds don't
Of course, if you're using newer routers you'd not be having this slow DNS lookup problem and specifying the ISPs DNS Servers would be appropriate... still
What you want to specify here is your ROUTER's IP:
eg. 192.168.0.1
With this simple modifcation you'll be fine. Why? You ask?
In Linux / OSX (I imagine in Unix as well) the way the lookups are carried out are different from Windows. I have other Windows computers on our network and they never had DNS lookup problems and they've been given the ISPs DNS IPs... anyway I think I'm talking out of my depth now heh.
This works!
Remember: Specify your router as the DNS Server!

I've had this problem on a G4 PowerMac running Panther, and it still had it after a Tiger upgrade. I just replaced it with a Core Duo MacMini, 10.4.7, same problem of slow DNS lookups (i.e., slow initial start to loading a web page, then it goes quickly). Windows machines on the same subnet have no such problem. I've tried the various suggestions on various forums, none of which worked. I tried:
- turn off IPv6 (no help)
- directly enter my ISPs DNS servers (no help)
- manually configure both IP and DNS (no help, went back to DHCP)
- swear at the computer (a little help, mentally)
After some more reading, I tried resolving some addresses using the host command from the Terminal:
host -v www.apple.com 24.34.240.9
where the IP address is one of the DNS servers for my ISP (Comcast). I got a no server found message! I then tried the second DNS server in the Comcast list (found from my router), also no server found. Tried the third one in Comcast's list of DNS servers, and it worked. Entered it in System Preferences -> Network as a DNS server, and now web browsing is zippy! I verified that the two DNS servers that MacOS couldn't see are also down as far as Windows was concerned (using the nslookup command in windows).
What this tells me is that the OS X algorithm for handling unreachable or slow DNS servers is different from that in Windows. Maybe Windows remembers a bad experience with a DNS server and uses ones that it has success with, while OS X just keeps trying them in order, slowing timing them out until it finds one that works?
This could also explain many of the puzzling symptoms people have been seeing (things work some times, other times not; some people have luck specifying the DNS server manually, others don't). It all depends on what DNS servers got distributed to the Mac via DHCP, and how far down the list you have to go to find one that is responsive.
Anyone reading this forum with technical knowledge of both UNIX and Windows DNS lookup implementations? Is there some way to tweak in MacOS to make it perform more like Windows in this situation (like, maybe shortening the DNS server failure timeout)?

[SOLVED] Slow DNS lookup, I think

Hi
I have a really annoying problem. My DNS lookup in Arch is painfully slow. I know it's not a network problem, as I don't have any problems in my Ubuntu installation. I have tried to run two simple tests to show you what I mean. The first is a simple ping google.
########### Ubuntu ###########
carsten@carsten-laptop:~$ time ping -c 3 www.google.com
PING www.l.google.com (216.239.61.104) 56(84) bytes of data.
64 bytes from sn-in-f104.google.com (216.239.61.104): icmp_seq=1 ttl=245 time=17.4 ms
64 bytes from sn-in-f104.google.com (216.239.61.104): icmp_seq=2 ttl=245 time=20.6 ms
64 bytes from sn-in-f104.google.com (216.239.61.104): icmp_seq=3 ttl=245 time=11.4 ms
--- www.l.google.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 11.465/16.529/20.641/3.809 ms
real 0m2.290s
user 0m0.000s
sys 0m0.004s
########### Arch ###########
carsten ~/Desktop $ time ping -c 3 www.google.com
PING www.l.google.com (216.239.61.104) 56(84) bytes of data.
64 bytes from sn-in-f104.google.com (216.239.61.104): icmp_seq=1 ttl=245 time=12.3 ms
64 bytes from sn-in-f104.google.com (216.239.61.104): icmp_seq=2 ttl=245 time=10.7 ms
64 bytes from sn-in-f104.google.com (216.239.61.104): icmp_seq=3 ttl=245 time=12.4 ms
--- www.l.google.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2007ms
rtt min/avg/max/mdev = 10.776/11.867/12.476/0.778 ms
real 0m15.305s
user 0m0.013s
sys 0m0.007s
Ubuntu: 0m2.290s vs. Arch: 0m15.305s.
In the second test I tried to fake a pacman update by downloading the .db files from my primary server. On both Ubuntu and Arch I used this simple script
repos=( core extra community )
time for repo in ${repos[@]}
do
wget http://archlinux.unixheads.org/$repo/os/i686/$repo.db.tar.gz
done
When I run it in, I get this result
########### Ubuntu ###########
carsten@carsten-laptop:~/Desktop$ ./updatetest
--2008-11-10 07:58:23-- http://archlinux.unixheads.org/core/os/i686/core.db.tar.gz
Resolving archlinux.unixheads.org... 204.152.186.174
Connecting to archlinux.unixheads.org|204.152.186.174|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 32515 (32K) [application/x-gzip]
Saving to: `core.db.tar.gz'
100%[=============================================================>] 32.515 --.-K/s in 0,1s
2008-11-10 07:58:23 (331 KB/s) - `core.db.tar.gz' saved [32515/32515]
--2008-11-10 07:58:23-- http://archlinux.unixheads.org/extra/os/i686/extra.db.tar.gz
Resolving archlinux.unixheads.org... 204.152.186.174
Connecting to archlinux.unixheads.org|204.152.186.174|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 422622 (413K) [application/x-gzip]
Saving to: `extra.db.tar.gz'
100%[=============================================================>] 422.622 242K/s in 1,7s
2008-11-10 07:58:25 (242 KB/s) - `extra.db.tar.gz' saved [422622/422622]
--2008-11-10 07:58:25-- http://archlinux.unixheads.org/community/os/i686/community.db.tar.gz
Resolving archlinux.unixheads.org... 204.152.186.174
Connecting to archlinux.unixheads.org|204.152.186.174|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 369845 (361K) [application/x-gzip]
Saving to: `community.db.tar.gz'
100%[=============================================================>] 369.845 206K/s in 1,8s
2008-11-10 07:58:27 (206 KB/s) - `community.db.tar.gz' saved [369845/369845]
real 0m3.837s
user 0m0.016s
sys 0m0.036s
########### Arch ###########
carsten ~/Desktop $ ./updatetest
--2008-11-10 08:01:33-- http://archlinux.unixheads.org/core/os/i686/core.db.tar.gz
Resolving archlinux.unixheads.org... 204.152.186.174
Connecting to archlinux.unixheads.org|204.152.186.174|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 32515 (32K) [application/x-gzip]
Saving to: `core.db.tar.gz'
100%[==============================================================================>] 32,515 --.-K/s in 0.1s
2008-11-10 08:01:47 (303 KB/s) - `core.db.tar.gz' saved [32515/32515]
--2008-11-10 08:01:47-- http://archlinux.unixheads.org/extra/os/i686/extra.db.tar.gz
Resolving archlinux.unixheads.org... 204.152.186.174
Connecting to archlinux.unixheads.org|204.152.186.174|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 422622 (413K) [application/x-gzip]
Saving to: `extra.db.tar.gz'
100%[==============================================================================>] 422,622 253K/s in 1.6s
2008-11-10 08:02:02 (253 KB/s) - `extra.db.tar.gz' saved [422622/422622]
--2008-11-10 08:02:02-- http://archlinux.unixheads.org/community/os/i686/community.db.tar.gz
Resolving archlinux.unixheads.org... 204.152.186.174
Connecting to archlinux.unixheads.org|204.152.186.174|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 369845 (361K) [application/x-gzip]
Saving to: `community.db.tar.gz'
100%[==============================================================================>] 369,845 262K/s in 1.4s
2008-11-10 08:02:17 (262 KB/s) - `community.db.tar.gz' saved [369845/369845]
real 0m44.153s
user 0m0.047s
sys 0m0.017s
Ubuntu: 0m3.837s vs. Arch: 0m44.153s
I get the same update time whenever I update pacman normally.
I have googled a lot to figure out an answer, but nothing helps, so I was hoping somebody could help me figure this out, as it's very annoying. My hosts file looks like this
hosts:
# /etc/hosts: static lookup table for host names
#<ip-address> <hostname.domain.org> <hostname>
127.0.0.1 localhost.localdomain localhost arch
# End of file
rc.conf:
# /etc/rc.conf - Main Configuration for Arch Linux
# LOCALIZATION
# LOCALE: available languages can be listed with the 'locale -a' command
# HARDWARECLOCK: set to "UTC" or "localtime"
# USEDIRECTISA: use direct I/O requests instead of /dev/rtc for hwclock
# TIMEZONE: timezones are found in /usr/share/zoneinfo
# KEYMAP: keymaps are found in /usr/share/kbd/keymaps
# CONSOLEFONT: found in /usr/share/kbd/consolefonts (only needed for non-US)
# CONSOLEMAP: found in /usr/share/kbd/consoletrans
# USECOLOR: use ANSI color sequences in startup messages
LOCALE="en_US.utf8"
HARDWARECLOCK="UTC"
USEDIRECTISA="no"
TIMEZONE="Asia/Singapore"
KEYMAP="dk"
CONSOLEFONT=
CONSOLEMAP=
USECOLOR="yes"
# HARDWARE
# MOD_AUTOLOAD: Allow autoloading of modules at boot and when needed
# MOD_BLACKLIST: Prevent udev from loading these modules
# MODULES: Modules to load at boot-up. Prefix with a ! to blacklist.
# NOTE: Use of 'MOD_BLACKLIST' is deprecated. Please use ! in the MODULES array.
MOD_AUTOLOAD="yes"
#MOD_BLACKLIST=() #deprecated
MODULES=(e100 mii iwl3945 fuse acpi-cpufreq cpufreq_ondemand cpufreq_conservative cpufreq_powersave loop !pcspkr !snd_pcsp)
# Scan for LVM volume groups at startup, required if you use LVM
USELVM="no"
# NETWORKING
# HOSTNAME: Hostname of machine. Should also be put in /etc/hosts
HOSTNAME="arch"
# Use 'ifconfig -a' or 'ls /sys/class/net/' to see all available interfaces.
# Interfaces to start at boot-up (in this order)
# Declare each interface then list in INTERFACES
# - prefix an entry in INTERFACES with a ! to disable it
# - no hyphens in your interface names - Bash doesn't like it
# DHCP: Set your interface to "dhcp" (eth0="dhcp")
# Wireless: See network profiles below
#eth0="eth0 192.168.0.2 netmask 255.255.255.0 broadcast 192.168.0.255"
eth0="dhcp"
INTERFACES=(!eth0 !wlan0)
# Routes to start at boot-up (in this order)
# Declare each route then list in ROUTES
# - prefix an entry in ROUTES with a ! to disable it
gateway="default gw 192.168.0.1"
ROUTES=(!gateway)
# Enable these network profiles at boot-up. These are only useful
# if you happen to need multiple network configurations (ie, laptop users)
# - set to 'menu' to present a menu during boot-up (dialog package required)
# - prefix an entry with a ! to disable it
# Network profiles are found in /etc/network.d
# This now requires the netcfg package
#NETWORKS=(main)
# DAEMONS
# Daemons to start at boot-up (in this order)
# - prefix a daemon with a ! to disable it
# - prefix a daemon with a @ to start it up in the background
DAEMONS=(syslog-ng !network hal !netfs crond fam wicd cups laptop-mode oss gdm)
SPLASH="splashy"
Thanks in advance!
Last edited by Sharpeee (2008-11-15 10:39:42)

Just tried to remove the "search..." line from my /etc/resolv.conf file, but nothing! It's okay if I remove the line after it connects right? Wicd overwrites the file anyways if I reconnect.
I don't really think changing to a different network-manager will help me. It works perfectly fine in Ubuntu with both network-manager and wicd, do don't think that's the problem. It must be a configuration file somewhere.
#### EDIT ####
I just tried to disable wicd and enable the wired network in /etc/rc.conf. After a reboot and it's still the same, even on the wired, so it's got be some other settings somewhere that's messing things up!
Also, for some reason my theme, in Gnome, isn't loaded after I disabled wicd? I have to manually run "gnome-appearance-manager"??
Last edited by Sharpeee (2008-11-11 05:01:46)

Wireless Intermittent Super Slow DNS lookup bug in 10.6.4

I don't normally post things on forums these days, as usually I can find just about any solution by searching long enough, but this issue has perplexed me to the point I actually had to come on here.
Believe me, that's a big deal, I don't give up easily.
I have spent -countless- hours searching, on here, on google, on any "solutions" or "technical" sites I could find, and the closest I can find to a solution are countless people complaining about the EXACT SAME PROBLEM that I have observed and, repeatedly, reproduced again and again, which in every single case boil down to this:
You had 10.6.x (x being 3 or less) with a wireless connection on your home network and all is well.
You upgraded to 10.6.4 and all seemed fine for maybe 24 hours or so... then it happens. You go to load a website, and it's "looking for site" or "waiting for site" in your status bar... hmm, maybe it's just this site you say, so you try another, or a few others in other tabs, but they all have the same problem.
You try to ping the sites, but the network utility can't resolve the domain to even ping them.
Your roommate, all the while, is surfing and gaming just fine on the exact same router you are on, so no, it's not the network hardware, it's not your ISP, hmm, what could it be?
All of a sudden, ALL of the sites you had in like 20 tabs load up at screaming speeds, "WOW" you say, "guess there must have just been some gunk in the wires or something" (notice the irony of the situation: no wires)... anyway, all seems fine again suddenly, surfing is fine for a few minutes, you're back to normal... and it happens again, suddenly NO site will resolve, NO dns will resolve, you can't check email or ping any domain... and so the cycle begins. Of course, you can just plug an ethernet cable straight into the router, but doesn't that kind of defeat the purpose of having wireless networking in the first place?
It continues like this, indefinitely, and it all starts roughly 24 hours after 10.6.4 has been installed.
I have read reports of people on macbooks, people on imacs, people on all sorts of different wireless hardware, but the symptoms are the same.
I know the problem is with the OS update, it's purely software. I know that it has nothing to do with hardware because simply reverting to 10.6.3 solves the problem -every single time- and then "upgrading" to 10.6.4 causes the problem to come back within 24 hours -every single time- (have been reverting using Time Machine to simplify this testing process), so no, where the problem is isn't what perplexes me; what perplexes me is that there are posts that started almost a few days after 10.6.4 came out, and so far there's STILL no fix? Are you freaking serious? Does the Apple programming team not have access to anything other than Apple-Branded Airport Extreme Base Stations to perform wireless network QA testing on?
Get a Linksys guys, grab a D-Link, go get some of the hardware people actually USE and test it on that and see what happens, it doesn't take long to see what's happening.
I blame the programmers because I am one myself and know how easy it is to screw up a rock-solid system with one little typo. Heck, which patch was it, 10.5.7 or 10.5.8 I think? Can't remember exactly, but it was supposed to be such a great "bug fix" patch... and it came with the config file for Apache set to DENY ALL INCOMING EXTERNAL CONNECTIONS by default (in a hidden file that can only be modified by the root user mind you... so much for the average user running a personal web server on THAT version), so yeah, one tiny mistake and it has huge consequences, my question is: what's taking so long to track down what's going on in 10.6.4 and fix it? Can we at least get a patch or something?
I find it really lame and really such a cop-out to see so many irrelevant "solutions" offered, "try specifying different DNS servers" (doesn't matter, whatever causes this bug doesn't care which servers you have specified, it simply sits there and does NOTHING for 2-3 minutes, and THEN when it actually DOES do a dns lookup, it gets the results in the time expected: instantly), to more extreme matters, like resetting hardware, which again has absolutely nothing to do with this bug.
Here is why anyone can see this is an obvious bug that the programming team needs to admit, investigate and correct:
A. happens immediately after the software update
B. happens to EVERYONE who uses traditional wireless routers for internet use
C. is 100% repeatedly reproducible
D. occurs on all different models of computers and all different ISP's and with all different DNS servers specified.
E. has the same symptoms on every system (lightning fast internet for 2-3 minutes, then "waiting for site" for 1-3 minutes)
F. affects EVERY network-using program on the computer (email, network utility, firefox, safari) SIMULTANEOUSLY
G. does not affect surfing to or interacting with IP addresses directly, only with trying to perform DNS lookups from ANY program with ANY dns server (or no dns server) set in network preferences.
Come on guys, just read it through, think about it for a few minutes, for anyone that has worked with and knows the underlying source code, and what changes went in between 10.6.3 and 10.6.4 specifically to networking, should have a light bulb pop up over their head and say "oh YEAH, we never uncommented that one line..." or something to that effect.

I see a very similar issue, but it's been occurring on my laptop for 4 or 5 months, which must be way before 10.6.4. My roommate and friend's laptops all work fine on my network. And my laptop works fine on anyone else's network. But MY laptop on MY network always gives the abysmal DNS performance as described in the original post: 40% of requests time out. Wireless or wired, it doesn't matter. Exact same behavior.
It also doesn't matter whether I use my Netgear router as DNS server, or my ISP, or OpenDNS, or Google. Exact same behavior.
When I do a network trace, it looks like most DNS requests my computer sends out simply never get responded to. (Could they be malformed when they hit the wire? I don't even see an error reply) A few make it through. And when there's a IPv6 (AAAA) record sent, my computer returns a "port unreachable" ICMP message. A screenshot of all of this dialogue is here:
http://img545.imageshack.us/i/screenshot20100913at114.png/
I recently had opportunity to cancel my cable service, and reinstate it for a lower price. They came out, tested the line (strong signal), gave me a new cable box. Yet the issue persists. Exact same behavior.
Firewall is disabled. I've deleted the network interfaces and added them back. Nothing helps.
(As I recall, this issue may even have been present before I reinstalled 10.6 over 10.5, so I'm not too confident a total reinstall would help.)
Any help? I'm about ready to buy a new laptop to fix this damned problem. Web browsing is nearly impossible, as is.

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I was running firmware 1.3.98-tm - and everything seemed to be working fine (no complaints from me - things ripped)
Serial Number :      DEZ00610370x
Firmware version :      1.3.98-tm (Jun 20 2008   18:37:29)
CPU :    Intel IXP425-533
Not sure if I have V1 or V2 hardware - or how to tell.
But that said - I upgraded to 2.0.0.19-tm yesterday. Upgrade went smoothly. All settings seemed to be retained after upgrade.
It now seems that DNS lookups intermittently fail - and/or are definitely slower.
I am assuming it is the DNS lookup that is taking more time (or failing) - as I use a product from Firetrust called Mailwasher Professional - which every 15 minutes - connects to all of my POP3 servers (about 8 of them - simultaneously) - and attempts to download a portion of each message for some Bayesian analysis. During the initial connection attempts - multiple failures occur with multiple e-mail accounts - indicating messages like "No Such Host". On a retries - it either works - or - produces the same error. What is further weird - when I set the Mailwasheer product to check each of the accounts "serially" - one by one - no errors occur. Problem seems to evidence itself only when router is presented with multiple lookups. The same behavior is evidenced within Firefox - when checking for updates to my extensions(much slower with the new firmware)
I backed out the firmware upgrade - and every is now working satisfactorily. Re-apply the new firmware - and the DNS weirdness returns.
Anyone out there having similar problems - or have any ideas?
I like running with the latest firmware - but I just can't live with this level of performance degradation.
Regards,
Doug
Environment:
Windows® Vista® Ultimate SP2 64-bit {EN}
Intel® Core™2 Quad Q9400 / Memory: 4GB
Intel® 82562V-2 10/100 Network Connection

Just tried that - but problem still ocurrs ??? Somehow the "router" is still "in the way".
Regards,
Doug
Network Setting Status
LAN                  IP :
192.168.1.1
WAN1 IP :
69.113.140.xxx
WAN2 IP :
0.0.0.0
Mode :
Gateway
DNS (WAN1) :
DNS (WAN2) :
167.206.254.2      167.206.254.1
DDNS(WAN1   |   WAN2)                 :
Off       |       Off
DMZ                  Host :
Disabled
DNS
DNS Server                    (Required) 1:
2:

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Thanks
Rich

Sounds like CSCtb17186 http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCtb17186
that Joe mentioned in https://supportforums.cisco.com/message/676256#676256

"Save As" command with very slow Finder response in Tiger

Ever since upgrading to Tiger using the "Archive & Install" option, my applications have had very slow operation of the "Save As" command. The Finder takes a long time to open and display the Save As window with folders and file name etc. This has occurred on all of my computers - a PowerMac G5, an iMac G4 and a PowerBook G4. It has not changed with upgrades as far as 10.4.5. I have tried the following suggested in another post about slow Finder actions without success:
Refreshing and reblessing the following system files and the folder followed by reboot.
1. /System/Library/Extensions.kextcache
2. /System/Library/Extensions.mkext
3. /System/Library/Caches/com.apple.kernelcaches/
Trashing the following files and a folder followed by reboot
1. /Library/Caches/com.apple.LaunchServices-xxxx.csstore
2. /Library/Caches/com.apple.LaunchServices-xxxxxx.csstore
3. /Library/Caches/com.apple.ATS/
I have also deleted the /User/Library/Preferences/com.apple.finder.plist file and rebooted.
Does anyone else have this problem and how do I solve it?
PowerMac G5 Mac OS X (10.4.4)

Thank you Roger - this does seem to have solved the problem - my local Apple service people did not have an answer on this, so I'm grateful

Slow DNS Lookups after connecting via PPP VPN

I have this very annoying problem and just can't seem to find a method to resolve it.
When I connect to my work network via a PPP VPN connection, all internet connectivity thereafter takes forever to do a DNS lookup. So when I browse the internet it takes ages before the page is displayed back.
If I also do a ping in finder for a random URL, www.google.com for example, it sits there for nearly a minute before I get a response. If I then immediately perform the ping again, I get a response straight away. So it seems once it's resolved the domain name, it gets stored in a cache somewhere. If I try another domain name, I get the same delay and then it eventually gets through.
As soon as I close the VPN connection, service is resumed and DNS lookups work fast.
I've also made sure I've unchecked the option to "Send all traffic over VPN connection".
I've also set my 'Service Order' to have my wireless Airport connection in the No #1 position.
The other thing I've tried is deleting the default route (via Terminal) and adding one manually that points to my wireless router, again without success.
Does anyone have any other ideas I could try? I've also recently re-installed a fresh copy of Leopard in case something was stuffed up, but the problem is still there after installation.
Hoping someone has an easy solution!
Many thanks

I seem to have found a work-around. There is probably a neater way of doing this but here goes.
Here is my setup:
Airport Wireless to my home router
PPP VPN connection to my office windows network
3G connection via mobile phone
My aim was to be able to connect to my office network via wireless at home or via my cellular data connection, but continue to route all non-work traffic via the main connection (wireless/3G).
The #1 problem I had once I connected to my office VPN on either wireless or 3G, was that DNS lookups to general internet sites took forever. So to get around this, I created TWO VPN connections to my office network in Network Preferences and in both connections I made sure the option to send all traffic over VPN was left UNCHECKED.
The first connection I then designated for use when connecting wirelessly at home. Here I manually added the IP address of my home router as a DNS entry.
The second connection I did the same by adding a new DNS entry, except here I used the DNS server of my cellular data connection, in this case T-Mobile UK.
When connecting to my office network I just use either of the above connections depending on whether I am connecting wirelessly at home or via my mobile phone.
It seems a bit long winded I grant you, but after literally months of trying to resolve this annoying problem, this appears to be the only fix that works.
The downfall of this would be that DNS resolution to any servers on your office network might not work, but that isn't a problem for me since I manually add any servers I use at work to my local hosts file. This negates any need for DNS lookups and actually speeds up access to my work servers.
In amongst this I did several reboots, so you give your machine a reboot once you've completed the above steps, just in case.
The 3G connection won't work for you if your provider changes the DNS server every time you connect, but this is unlikely.
If anyone's got any comments, I'd love to hear them.
Cheers
Phil

Slow DNS lookup

For the past two days, my internet has really slowed down. The problem appears to be a "pokey" DNS server. In many cases, it would take longer for the DNS server to work, than to download the web pages. This morning, the problem seems fixed -- DNS lookup is pretty much "instantaneous" again. I still have my DNS settings to let Comcast determine the server. Is it OK if I change the settings to a specific DNS Server? If so, does anyone have any recommendations about which one to use? TIA ---

Try using the Google or the OpenDNS offerings. Search google for info.

High synch rate with VERY slow throughput

Help!!!
I'm hoping that the one of the mods on here may be able to intervene and help get my issue sorted.
I had my home broadband upgraded to adsl2 on the 8th of Feb. after 5 years of hassle free service on up to 8 Meg service.
From the day of upgrade (of which has given no significant increase in speed by the way), I've had an issue with fluctuating throughput whilst my synch rate remains rock solid at 6.5-7mb/s.
On any given day I can get my full expected throughput of between 6 and 6.5mb/s but can have long periods of dial up speeds at 40-50kbp/s which can be morning, day or night, so not a peak time bandwidth cap/throttle issue. I have given it the 10 day stabilisation before taking up with tech helpdesk, but after nearly 2 weeks of calls and going round in circles I'm running out of patience.
Can I just add I'm an Openreach engineer who deals with broadband/SFI faults daily so have made sure the issue does not lie within the network or premises. I've also taken a hub and connected it direct on to the adsl out port of the exchange mdf and witnessed the same speed problems, so am in no doubt that the problem is with BT. When I try to explain to the helpdesk advisors it doesn't seem to register. Whether it's down to a fault on my port or a general congestion issue on the backhaul I don't know but just need someone to get to the bottom of it for me
I am awaiting a call back with an update in the next 2 days but judging by the way thing have gone down so far I'm not confident I'll get a result, so was hoping someone on here could help.

in order to get things moving you need to post your router adsl stats and also btspeedtester results. would help if you can post a good set where download is ok and then a poor set for comparison
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Time Capsule with very slow network throughput

I have a TC that is only supply about 5% of the network throughput it should do.
We ahve a 2MB connection and any computer that is connecting to the TC wirelessly is only getting around 0.1MB. The signal is strong, the noise is low, it's on an isolated channel (no other networks overlapping). It does this regardless of whether I switch to wireless-g or wireless-n (2.4GHz or 5GHz) and regardless of which channel I select.
I plugged in a different TC and I got my 2MB connection no problem.
So I think the first TC is knackered. Luckily it's still under the 90 warrantee. I want to return it to get a replacement, but I can't get through to the apple care telephone service. I've been on hold for 20 mins then got cut off without talking to anyone - this happens every time I call. Why on earth anyone would pay for apple care is beyond me if you can't even get through to Apple!
Can you just take a TC back to an Apple Store and get a straightforward replacement?

Sorted it! I hit the factory reset button on the back and started again from scratch.
There must have been some software issue in the TC itself that could not be addressed through the configuration interface.
I hope this helps anyone who has a similar problem. In summary this is what I was experiencing:
1. When connected Mac Mini to TC with ethernet cable I had top speed access - so no drive writing issues.
2. Set up the TC to share our 2Mb internet connection as a wireless-g network. When connected a laptop to TC via the TC's wireless-g network I had excellent signal strength, low noise, and an uncluttered channel (as indicated by iStumbler) - so no interference issues with other netowrks, microwaves, cordless phones etc.
3. The laptop reported an excellent signal strength and potential rate of 54Mb.
4. Used an online broadband speed tester (www.cnet.co.uk/misc/speedtest) on the laptop to determine the actual throughput. The result was around 0.2Mb. Not good.
5. Tried copying a file from the TC over to the laptop and monitored the throughput using the laptop's performance monitor. The result was still around 0.2MB.
6. Tried changing the wireless-g channel. Same result.
7. Repeated the above with a wireless-n network. Same result.
8. Finally, hit the factory reset and repeated points 2 - 4 above. Got almost 2Mb, which is what I was after!
Hope this helps someone.

Problem with very slow scale, rotate and translate

Hi -
Here is the basic problem. I want to take a bufferedImage (read from a jpeg earlier on) and then rotate it according to an angle value (radians) and then resize it to fit within a specifically sized box. My code works fine, but... I have to do this in a loop up to 200 times. The process is often taking several minutes to complete. If this is simply a consequence of what I am trying to do, then I'll accept that, but surely I am just doing something wrong? Please help!
Thanks - here is the (working but very slow) code
    public Graphics2D get_shape_image(Graphics2D g, BufferedImage b, double shaperotation, double space_width, double space_height,
            float x_scale_factor, float y_scale_factor, float shapeTransparency){
        // Work out the boundimg box size of the rotated image
        double imageWidth = (double) b.getWidth();
        double imageHeight = (double) b.getHeight();
        double cos = Math.abs( Math.cos(shaperotation));
        double sin = Math.abs( Math.sin(shaperotation));
        int new_width = (int) Math.floor(imageWidth * cos + imageHeight * sin);
        int new_height = (int) Math.floor(imageHeight * cos + imageWidth * sin);
        // Create the new bufferedImage of the right size
        BufferedImage transformed = new BufferedImage((int) new_width, (int) new_height, BufferedImage.TYPE_INT_RGB);
        // Create the transform and associated AffineTransformOperation
        AffineTransform at = new AffineTransform();
        AffineTransformOp affine_op;
        // Make sure our image to be rotated is in the middle of the new image
        double x_movement = ((double) (new_width / 2.0d)) - ((double) imageWidth / 2.0d);
        double y_movement = ((double) (new_height / 2.0d)) - ((double) imageHeight / 2.0d);
        at.setToTranslation(x_movement, y_movement);
        affine_op = new AffineTransformOp(at, AffineTransformOp.TYPE_BILINEAR);
        transformed = affine_op.filter(b, null);
        // Now we need to rotate the image according to the input rotation angle
        BufferedImage rotated = new BufferedImage((int) new_width, (int) new_height, BufferedImage.TYPE_INT_RGB);
        at.setToRotation(shaperotation, (double) new_width / 2.0d, new_height / 2.0d);
        affine_op = new AffineTransformOp(at, AffineTransformOp.TYPE_BILINEAR);
        rotated = affine_op.filter(transformed, null);
        // Do the scaling so that we fit into the grid sizes
        BufferedImage sizedImage = new BufferedImage((int) (space_width * x_scale_factor), (int) (space_height * y_scale_factor), BufferedImage.TYPE_INT_RGB);
        double xScale = (double) (space_width * x_scale_factor) / (double) new_width;
        double yScale = (double) (space_height * y_scale_factor) / (double) new_height;
        at.setToScale(xScale, yScale);
        affine_op = new AffineTransformOp(at, AffineTransformOp.TYPE_BILINEAR);
        sizedImage = affine_op.filter(rotated, null);
        // Finally translate the image to the correct position after scaling
        double x_adjust = (space_width / 2.0d) - ((space_width * x_scale_factor) / 2.0d);
        double y_adjust = (space_height / 2.0d) - ((space_height * y_scale_factor) / 2.0d);
        // Set the transparency
        AlphaComposite ac = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, shapeTransparency);
        g.setComposite(ac);
        // Draw the image as long as it's above 0 size
        if (sizedImage.getWidth() > 0 && sizedImage.getHeight() > 0)
            g.drawImage(sizedImage, null, (int) x_adjust, (int) y_adjust);
        return g;
    }

Your code worked okay in my system: busy at 200fps using 1.0f for alpha and
the x/y scale_factor values.
Here's another approach that isn't quite as busy.
import java.awt.*;
import java.awt.geom.*;
import java.awt.image.BufferedImage;
import java.io.*;
import javax.imageio.ImageIO;
import javax.swing.*;
public class XTest extends JPanel
    BufferedImage image;
    int gridWidth = 100;
    int gridHeight = 100;
    double theta   = 0;
    double thetaInc;
    public XTest(BufferedImage image)
        this.image = image;
        thetaInc = Math.toRadians(1);
    protected void paintComponent(Graphics g)
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                            RenderingHints.VALUE_INTERPOLATION_BICUBIC);
        int w = getWidth();
        int h = getHeight();
        int imageW = image.getWidth();
        int imageH = image.getHeight();
        // rather than making a new BufferedImage for each step of
        // the rotation and scaling let's try to rotate, scale and
        // fit the source image directly into the grid by using
        // transforms...
        // rotation
        AffineTransform rotateXform = new AffineTransform();
        double x = (w - imageW)/2;
        double y = (h - imageH)/2;
        rotateXform.setToTranslation(x,y);
        rotateXform.rotate(theta, imageW/2.0, imageH/2.0);
        // get rotated size for source
        double cos = Math.abs( Math.cos(theta));
        double sin = Math.abs( Math.sin(theta));
        double rw = Math.rint(imageW * cos + imageH * sin);
        double rh = Math.rint(imageH * cos + imageW * sin);
        // scale factors to fit image into grid
        double xScale = gridWidth / rw;
        double yScale = gridHeight / rh;
        // scale from center
        x = (1.0 - xScale)*w/2;
        y = (1.0 - yScale)*h/2;
        AffineTransform scaleXform = AffineTransform.getTranslateInstance(x,y);
        scaleXform.scale(xScale, yScale);
        scaleXform.concatenate(rotateXform);
        g2.drawRenderedImage(image, scaleXform);
        // markers
        // grid
        g2.setPaint(Color.red);
        int gx = (w - gridWidth)/2;
        int gy = (h - gridHeight)/2;
        g2.drawRect(gx, gy, gridWidth, gridHeight);
        // bounds of unscaled, rotated source image
        g2.setPaint(Color.blue);
        double rx = (w - rw)/2;
        double ry = (h - rh)/2;
        g2.draw(new Rectangle2D.Double(rx, ry, rw, rh));
    public void rotate()
        theta += thetaInc;
        repaint();
    public static void main(String[] args) throws IOException
        BufferedImage bi = ImageIO.read(new File("images/bclynx.jpg"));
        XTest test = new XTest(bi);
        Activator activator = new Activator(test);
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setContentPane(test);
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
        activator.start();
class Activator implements Runnable
    XTest xTest;
    Thread thread;
    boolean animate;
    public Activator(XTest xt)
        xTest = xt;
        animate = false;
    public void run()
        while(animate)
            try
                Thread.sleep(50);
            catch(InterruptedException ie)
                animate = false;
                System.out.println("interrupt");
            xTest.rotate();
    public void start()
        if(!animate)
            animate = true;
            thread = new Thread(this);
            thread.setPriority(Thread.NORM_PRIORITY);
            thread.start();
    public void stop()
        animate = false;
        thread = null;
}

Issue with very slow DNS lookup. SBS 2008 R2.

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