What if DNS fails?

Hi,
I was doing tests on my 11g R2 RAC. I wanted to simulate if DNS was down, what will happen. And, I got the following.
ERROR:
ORA-12545: Connect failed because target host or object does not exist
Enter user-name:
Anyone encountered this or have some workarounds to share?
Thanks.

Hi,
there is some more information needed, to answer your question:
=> From where did you try to connect (Server/Client)?
=> What did you use as connect string?
=> If you used a TNSNAMES.ORA entry, how did that look like?
=> If you tried connecting to a normal VIP Hostname, the workaround would be /etc/hosts. How does /etc/hosts look like?
=> How did you simulate the DNS server down?
BTW: If you DNS is down and you try to connect via. SCAN an error is expected, since the SCAN name cannot be resolved (without a DNS).
Sebastian

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WiFi only works close to router, DNS fail, Signal Bars present but Safari says no Internet, I've deleted and readded through to reset and full reset, I had no problem with 4.3.2 only 4.3.3 both my iPhone4 and my iPad2. I am now beside router - no problem

Help
WiFi only works close to router, DNS fail, Signal Bars present but Safari says no Internet, I've deleted and re-added through to reset and full reset, I had no problem with 4.3.2 only 4.3.3 both my iPhone4 and my iPad2. I am now beside router - no problem, but go 20 metres and WiFi becomes unstable. Only way to get either to work is disable WiFi either as a Hot Spot or turn it off and use the 3G connection. This worked with 4.3 & 4.3.2 what has gone wrong? I raised it at the Apple Store in Belfast as a problem but was told that there was no problem with Apple but I must have a faulty router - yeah - that's a lot of faulty routers, my home, my office, my holiday home, Starbucks, my friends house, my son's house. I've tried all the 'fixes'. I think it is a plan to force us to buy Apple Routers

Two ways out, I added two more Belkin Access Points in my house in Spain so that I'm not more than 10Mtrs away, (Reinforced Concrete & solar glass 2010)
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Does anyone know what a DNS relay 10.0.1.1 is?

My console shows this message alot:
b-cs-ibook-g4 mDNSResponder: NOTE: Wide-Area Service Discovery disabled to avoid crashing defective DNS relay 10.0.1.1.
What is a DNS relay?
I've been having start up problems with 10.4.5 since I updated from 10.4.4.
Have done two clean reinstalls and am wondering if there is a relationship here.
But first I need to understand what a DNS relay is.
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ibook Mac OS X (10.4.5)

bbec
Welcome to the forums.
10.0.1.1 is the IP address of your NAT router, I would recommend resetting it before trying anything else.
Nevermind.
Powerbook 1Ghz G4 12 Mac OS X (10.4.5)

What does call failed and call busy mean?

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WuTom wrote:
If a call is marked as "Call ended" does this guarantee the other person ended the call, or can it also mean the call disconnected or was dropped?
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Thanks
Hi WuTom,
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Changing my dns setting saved my iPad! But what is "dns"?

http://dekoded.com/2010/05/09/ipad-slow-youtube-fix/
I have to share this because it worked for me.
I was having trouble viewing YouTube videos because of very slow loading times. I was advised to change my dns setting and like magic-- YouTube flows smoothly now!
But what is "dns"? Will changed setting affect anything else?
I was ready to take my iPad back because this was a deal breaker for me but now...I may just keep it!

DNS is the Domain Name Service, and it's used to translate Internet network addresses into names.
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123.123.123.001
Which is fine if you're a router, but hopeless if you're a person. DNS associates a name (e.g www.megacorp.com) with the address. When you enter the name the server resolves it to the address.
There are lots of DNS servers doing this: ISPs have them, big companies have them, and there are public ones (e.g Google and OpenDNS). They sometimes get out of sync, so changing DNS can fix some odd problems

What Could Be Failing? Garbled Screen, Late iMac 2009

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Thank you in advance. Have a great holy week & a advanced happy Easter.
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DNS failing to register

Background
all Server 2012 VMs...1 domain controller, multiple member servers. I have only one member server that is having DNS issues. The problem was first discovered while trying to gpupdate /force, which failed stating there's a lack of network connectivity
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time service could not sync with the DC.
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Seems like too few info to decide what is your problem. My very first guess is that there is error in VM settings. Make sure that VMs has disabled time synchronization with host. Secon problem may stem from possible port blocking (try without fw) and third
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Here are references that may help:
https://technet.microsoft.com/en-us/library/cc727335(v=ws.10).aspx
If you use DHCP from network router (which is wrong configuration):
https://support.microsoft.com/en-us/kb/2459530
HTH
Milos

What does 'Activation: failed' mean?

After the reset that occurs when I attempted updating 4.4.1 to 4.4.2, I saw 'Activation: failed' in the general>about settings screen.
Now after a little while, it is no longer there. But, what does it mean, generally?

It is not properly connected to the network.
Make sure DNS is set to auto (settings - general - network)
If on wifi try ethernet
Make sure router has port 123 open (refer to manual if unsure)

DNS fails to resolve w/ 10.6.8

I have a home network consisting of 2 iMacs and 1 Macbook Pro, all running on 5 GHz N-band through an Asus RT-N56U dual-band router. The Macbook Pro and one of the iMacs are fine, however starting several months ago the third iMac began having a problem where it fails to resolve domain names, as many as 3 times a day. All 3 computers have identical network preferences, each with their own static LAN IP.
I looked through the Console logs for the problem iMac and found the same entries repeating, which appear to show mdnsResponder crashing:
mDNSResponder[18]
SendResponses: No active interface 0000000000000006 to send: 0000000000000000 08   41 _afpovertcp._tcp.local. PTR User's\032Computer._afpovertcp._tcp.local.
mDNSResponder[18]
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mDNSResponder[18]
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_BrowseReplyReceivedCallback (thread 0x7fff70463cc0): Error doing DNSServiceResolve(): -65540
mDNSResponder[18]
SendResponses: No active interface 0000000000000006 to send: 0000000000000000 04   15 User's\032Computer._device-info._tcp.local. TXT model=iMac10,1
/System/Library/CoreServices/Finder.app/Contents/MacOS/Finder[102]
BonjourBrowser::DNSServiceQueryRecord returned -65540
mDNSResponder[18]
ERROR: handle_resolve_request bad interfaceIndex 6
com.apple.usbmuxd[37]
_BrowseReplyReceivedCallback (thread 0x7fff70463cc0): Error doing DNSServiceResolve(): -65540
mDNSResponder[18]
SendResponses: No active interface 0000000000000006 to send: 0000000000000000 04   15 User's\032Computer._device-info._tcp.local. TXT model=iMac10,1
mDNSResponder[18]
SendResponses: No active interface 0000000000000006 to send: 0000000000000000 08   34 _rfb._tcp.local. PTR User's\032Computer._rfb._tcp.local.
mDNSResponder[18]
PenaltyTimeForServer: PenaltyTime negative -154358, (server penaltyTime -58278099, timenow -58123741) resetting the penalty
mDNSResponder[18]
ERROR: handle_resolve_request bad interfaceIndex 6
com.apple.usbmuxd[37]
_BrowseReplyReceivedCallback (thread 0x7fff70463cc0): Error doing DNSServiceResolve(): -65540
mDNSResponder[18]
ERROR: handle_resolve_request bad interfaceIndex 6
com.apple.usbmuxd[37]
_BrowseReplyReceivedCallback (thread 0x7fff70463cc0): Error doing DNSServiceResolve(): -65540
mDNSResponder[18]
mDNSResponder mDNSResponder-258.21 (May 26 2011 14:40:13) stopping
mDNSResponder[18]
mDNSResponder mDNSResponder-258.21 (May 26 2011 14:40:13) starting
I did some Googling on the issue and came up with results similar to my problem, dating back as far as OS X 10.6.5, perhaps even earlier. Several people suggested killing/restarting mdnsResponder as a temporary fix using the following:
sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist
sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist
This appeared initially to be successful, however it turns out the fix is just that – temporary. DNS still breaks every day, leaving my iMac able to send and receive email, but unable to browse the Internet.

Hi,
Regarding search domains - those are not directly responsible for your internet conectivity.
You can read what they are here:
http://support.apple.com/kb/HT4845
regarding the mdnsResponder
You can try dragging this file to the desktop & rebooting.
Machintosh HD/System/Library/LaunchDaemons/com.apple.mDNSResponder.plist
This should clear the issue.
Please let me know how it goes.

DNS Fails for NFS Server Shares

When I boot, I get a message that DNS has failed for the NFS server mounts, and the shares do not mount. The message says, "mount.nfs: DNS resolution failed for server: name or service unknown." I have to mount the shares myself. Then when rebooting, I get the same error saying it can't unmount the shares.
this is /etc/resolv.conf:
$ cat /etc/resolv.conf
# Generated by dhcpcd from eth0
# /etc/resolv.conf.head can replace this line
nameserver 208.67.222.222
nameserver 208.67.220.220
# /etc/resolv.conf.tail can replace this line
this is /etc/conf.d/nfs:
# Number of servers to be started up by default
NFSD_OPTS=8
# Options to pass to rpc.mountd
# e.g. MOUNTDOPTS="-p 32767"
MOUNTD_OPTS="--no-nfs-version 1 --no-nfs-version 2"
# Options to pass to rpc.statd
# N.B. statd normally runs on both client and server, and run-time
# options should be specified accordingly. Specifically, the Arch
# NFS init scripts require the --no-notify flag on the server,
# but not on the client e.g.
# STATD_OPTS="--no-notify -p 32765 -o 32766" -> server
# STATD_OPTS="-p 32765 -o 32766" -> client
STATD_OPTS=""
# Options to pass to sm-notify
# e.g. SMNOTIFY_OPTS="-p 32764"
SMNOTIFY_OPTS=""
Do I need to add some option to rpc.statd, or is there some other misconfiguration there? AFAIK it is the default. What else should I look at to fix this? I can ping the server by name, and log in with ssh by name, just fine. It's only the nfs that is failing with DNS.

airman99 wrote:
Yahoo! Good news, I've finally solved the problem on my laptop. The message I was receiving turned out merely to be a network timing issue.
The error I was receiving was exactly correct and informative. When /etc/rc.d/netfs ran and executed a 'mount -a -t nfs...' the network was indeed NOT reachable. I am running networkmanager, and apparently during bootup, networkmanager gets loaded, but there is a delay between when networkmanager is loaded and when the network is available. In other words, networkmanager allows the boot process to continue before the network is available.
My daemons are loaded in this order (rc.conf):
DAEMONS=(syslog-ng hal dhcdbd networkmanager crond cups ntpdate ntpd portmap nfslock netfs)
Consequently, if I add a delay to /etc/rc.d/netfs to allow time for the network to come up, then when the NFS shares are mounted, the network is up. In my case I had to add a 3 second delay.
sleep 3
I'm sure this isn't the best way to solve the problem, by editing the system file /etc/rc.d/netfs, because the next upgrade where changes occur to netfs, my fix will get overwritten. But I'll keep it until I figure out the "right" fix.
The real solution is to not load networkmanager in the background, but to force startup to wait for the networok to be up before continuing.
there is the _netdev option you can use in fstab, but that doesn't always work:
http://linux.die.net/man/8/mount
_netdev
The filesystem resides on a device that requires network access (used to prevent the system from attempting to mount these filesystems until the network has been enabled on the system).
Alternatively, you could just add a cronjob to do a mount -a with a sleep 20 in there or something. You might have to play with the sleep value a little to make sure it's long enough

Global Load Balancing / Failover....what about dns entries being cached?

It is my understanding that DNS is used to provide data center redundancy. How does one resolve the problem of dns entries being cached across the Internet? For example, I fail-over to my secondary datacenter, the IP addresses of my primary datacenter will likely be cached in dns servers across the Internet. What are some options for datacenter redundancy that can overcome these issues of dns propogation delays?
Thanks!

The only option that you have is to run with a low TTL.
Unfortunately, there are applications out that that don't behave very well to a low TTL. Microsoft Internet Explorer, for example, needs to be restarted for it to do another name lookup. The same holds true for some proxies etc.
-A

What a victory: failed installs due to "shared technology" errors returns endless threads via Google

I purchased PSE 10 (download) and lit up an install. It failed. I searched Google and oddly, the moment I hit the terms "photoshop elements 10 install fail" I got 40-50 results for "shared technology" failures. You guys are failure stars!
By the way, I cannot thank you enough for wasting my day like this. Back in the old days one had to visit microsoft.com to waste an entire ******** day trying to get their poorly engineered product installed, after it's failed endlessly to do as expected. Bill would be proud, if he weren't busy out there earning billions of dollars by giving away millions...which is nicer than what I have to say about you right now. Who needs time with their kids? Install PSE!!! It's a great time soak!
So, with that, I beg of you to please start sending me the usual asinine, nonworking fixes-in-a-box to get this product installed on my machine, even though we both know it won't work. Meanwhile, I have purchased downloaded, installed, and started using the Corel's latest version of PSP, which nearly FLEW into my hard drive and immediately worked right out of the box. Boy, they suck, huh? No. They don't. You do.
I've followed the hilariously funny and equally useless advice on your help forums (my favorite: " If you are using a downloaded installer, or running the installation from the hard drive, the Shared Technologies can fail because of the installation path. Copy the installation files to a folder to the root of the drive." Really? So you're saying "to install this stupid product, first you must fix our stupid mistake." Love you. Truly, I do.) and nothing has worked. I assume you will end up pointing at Microsoft and calling them bad, since every other app on my computer works without this moronic, yet remarkably popular, failure.
And even if we get this (endlessly) failed implementation to work - emphasis on IF - I will probably de-install it and demand a refund, depending on whether PSP has their product up to par, which is far more likely than Adobe having a working fix.
Now, I will say for the record that I have been harsh, and snide, and nasty. I am tired, and frustrated, and it's been four hours, and I have had enough. Having said that, deal with it. I am your customer (for the moment). Why do I need to ask you to make your product work? Isn't that the point? Is it? Helloooo?

It has occurred to me that Adobe's support people may be cowards. Then again, I am being a jerk, and it's probable they may have read my comments and said "screw this guy." I might say that. Then again, if I worked for a world-class company like Adobe I might step up and defend my product.
Then again, I might not, because they fell off the tracks some time ago and failed to stay in sync with the technologies they need to work with (read: Microsoft) to the degree they have Google reflecting:
a.) Adobe's level of failure in compatibility given the immediate and numerous responses to the simple keywords "elements fail" returning an astonishing number of responses (mine at the top lately) and...
b.) Adobe's own technical staff offering roughly a dozen differing, non-working fixes to the issue and...
c.) Adobe's studied and intentional avoidance of my emails, this thread, and hilariously worthless chat support.
It is very likely the source of the issue is an administrator profile glitch on the MS side, or perhaps an MSI issue, but good luck getting that clarified from Adobe.
They!
Don't!!
Know!!!
And they don't care. All I can say about that is I am glad I only dropped sixty-odd bucks on this product rather than seven-odd hundred for CS6. Maybe I'd get support if I had, but these snotty threads would be YouTubed, Reddited, and published in the local paper.
Next: there has been a breakthrough! An amazing breakthrough!
Among the many useless and stupid bits of advice Adobe's staff throw around on the support site, there is a great recommendation to try to load the product in safe mode. Last night I booted into safe mode and tried to run the installer, which of course immediately popped a dialog box stating it couldn't run in safe mode, so there's Adobe's great advice for you. While I was laughing and taking screen shots for posterity I glanced at my desktop, and there it was: the Photoshop Elements 10 icon. What are you doing there? I double clicked, and viola! It was loaded all along! Opened right up with that blue screen with a thousand names of the dev team.
Wait. What? I thought it rolled back? It SAID it rolled back the install. No? That 5 minutes it spends “rolling back” it just pretends to roll back, deletes the icon, leaving my computer polluted with a product I already got a refund on from Amazon? Really?
Anyway I rebooted back into my normal state and lo and behold, the PSE 10 icon is still there on my desktop. It did not install from safe mode. It had been installed from the beginning, and for whatever reason booting into safe mode and rebooting back seems to fix whatever idiotic and mindless failure Adobe built into this thing which they couldn't otherwise help me fix. Plain reboots did not do this: only booting into and back out of safe mode.
Thinking I was imagining things, I got up this morning and checked. Yep. There it is on my desktop, working as if it had been there all along and I hadn't been ignored, avoided, led astray, given stupid advice, or sold a product that clearly wasn't ready for sale. PSE 10. Working. Seemingly fully functional. Glory be.
Now, since I am the one who fixed it, I was thinking Adobe should pay me. I spent about 10 hours fuming over this thing, and I bill $65 an hour as a consultant. I realize that I am not an Adobe coder or support specialist, but I fixed it and should be compensated for my time at my rate. A bonus is in order as well - call it pain and suffering. 10X$65 plus a little sweetener, let's call it a thousand bucks. What do you say, Adobe? Are you going to award my ingeniousness and brilliance? You couldn't handle it, and still can't, but I did it. Me. The bitchy, whiny one infesting your support board with angry hate. You owe me.
Yeah, I didn’t think so. Anyway, I have always liked PSE and have used past versions to great success. I think I will like PSE10 just as much, regardless the fact my view of Adobe is that much dimmer for the shamefully bad experience of late. This has been a pretty sucky couple of days, and from the boards and complaints I have found out it's the exception rather than the rule, but exceptional nonetheless.
Now I shall screenshot this thread and publish it everywhere I can find a place for it. I will call out the responses I received from Adobe (none) and the great support I received from Adobe (none) and the quality service I received from Adobe (none). Then I will do my level best to remember what the heck I was doing that made me want to buy PSE in the first place: there was a photo of...something, and I wanted to...do something. What was it? I've spent so much time in Adobe FailShop I have forgotten what I was doing here in this bottomless abyss of fail...
Ta taa, Adobe Support. Love you, really I do. True story.

What is DNS Services and why does it use so much data?

I have 300MB to use a month on my iPhone 4S (most recent iOS) and I'm normally pretty good with it because I'm connected to WiFi a lot. All of a sudden, my data usage spikes and my DNS services usage has gone up to 40MB. What is this and how do I keep it from spiking like this? It's incredibly annoying.
Also, any other tips on saving data while connected with the 3G? As mentioned before, I only have 300MB so I like to stretch it for the month.

DNS (Domain Name Service) is the Internet "address book" of web sites. Whenever you go to a site such as http://apple.com your browser must make calls to the DNS server specified in your Network Settings to translate "apple.com" into Apple's IP (Internet Protocol) address of 17.178.96.59. Any time you access any Internet resource (such as sending or receiving email, playing multi-player games, using a browser, Using any app that accesses data on the Internet such as news, weather, stocks, etc) one or more DNS lookups must be made. Many web sites have content from several different sites. Each site referenced on the page must also be looked up. Each query is small (~100 bytes), but they can add up.

What does 'Filter' Failed mean

I did a forum search and did not find anything on point.
I just pulled a Konica Minolta Magicolor 2400w printer out of storage. It has not been used in close to 6 years. Plugged into my MBP running Mountain Lion, and it could see the printer but did not have a driver.
Minolta's web support for drivers is sketchy, and it looks like the last update of the driver was 2005. Since the vintage of the printer was the same, I tried it. Was noted as the driver for OS X
The printer installs and is visible to all apps, but when I go to print, the job gets stopped in the queue with a message saying 'Filter' failed.
This is a new one on me. What gives? Is there a generic driver that might work?

Checking the KM Australia web site, I can only locate drivers for Windows. It also mentions this model supporting PCL and Postscript, so you could try the Generic Postscript or Generic PCL Laser driver included with OS X.
If these do not print then there is an alternate driver suite available via this link. Note that you have to install all three packages mentioned on the page.

Intranet DNS fails, Internet still works, Other programs can access Intranet, Ok up to 3.6.6, broken in 3.6.7 upgrade

Local DNS server (corporate intranet) does not like Firfofox requests.
Intranet sites end up with:
Host Not Found
DNS error (the host name of the page you are looking for does not exist) or Server did not accept the connection.
Please check that the host name has been spelled correctly.
All external sites resolve correctly.
All internal sites can be pinged & reached with IE.
Problem stared after 3.6.7 update; 3.6.6 was ok. No changes made to corporate network.
What changed in 3.6.7 that affected DNS / authentication with local DNS?
== This happened ==
Every time Firefox opened
== 3.6.7 update; 3.6.6 was ok. No changes made to corporate network.

You are not alone with issues related to the e1000e (but all they concluded was that reloading the module makes it work again):
https://bbs.archlinux.org/viewtopic.php?id=145564
It seems like this is more your issue:
http://permalink.gmane.org/gmane.linux. … devel/8932
But if none of those boot flags work for you, then there's not much you can do, and you'll have to write a script to reload the module each time after initial boot finishes I guess until the module gets fixed.
Also, power management of the PCIe interface causes the e1000e to shut off after a while as well (lots of people on CentOS noticing this):
http://serverfault.com/questions/226319 … ie-aspm-do
So you can use that boot parameter to stop that from happening, if that becomes an issue for you as well.

What if DNS fails?

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