Flush DNS

I have been told to flush my DNS by my webhost so that I can view my website control panel icons and access my webmail
The fix worked, however, when I went to the Mac store, I was told NEVER to do this because I could end up with a useless machine if I make an error
A few days later I am again, unable to use my website software and access my webmail
The host has told me to repeat flush DNS
Surely I shouldn't have to do this every time I want to check my emails if there is a risk that I will render my Mac useless?
Please advise
Thank you

Thank you for the response
I have rebooted it but I still can't access my webmail and my icons are still missing on my control panel
I am not in a position to change my host at the moment, is there anything else I can do?
Thank you again.

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I keep getting error 3004 when i try restoring and updateing my iphone 4 to iOS 7 i did everything 1. flushed dns 2. edited hosts 3. updated itunes and downloaded new one 4. switched usb ports 5. disabled antivirus 6. enabled ports 80 and 443 7. disabled

I keep getting error 3004 when i try restoring and updateing my iphone 4 to iOS 7 i did everything 1. flushed dns 2. edited hosts 3. updated itunes and downloaded new one 4. switched usb ports 5. disabled antivirus 6. enabled ports 80 and 443 7. disabled firewall 8. even tryed putting mobile in DFU mode to restore it not of this worked so please help me

please replyyy i'm stuck on this like whole week

How to Flush DNS Cache in Mavericks 10.9.3

So I have seen references to the following when searching for a cmd to flush DNS
sudo killall -HUP mDNSResponder and sudo dscacheutil -flushcache
Which one is proper for Mavericks 10.9.3?

Mountain Lion, but should be applicable to Mavericks.
DNS cache - Reset

Flushing dns mac os 10.9.2?

When I run suggested protocol to flush DNS (dscacheutil -flushcache;sudo killall -HUP mDNSResponder) nothing happens.
What I am really trying to do: I have an accumulation of websites that pop up as suggestions when I want to create a document hyperlink to a site on the web. i want to clear this list. Is that part of the DNS cache flush?
If not, how can I get rid of this list?
If so, why doesn't the protocol above work?
Thanks...

Thanks. I didn't ask the question very well.
I am doing a power point presentation and am creating hot links to pages of websites.
In the dialog box to insert a hyper link there is a field at the top ("link to") in which the destination website address is supposed to be entered.
There are "suggested" websites in a list that shows up when I click on the arrow to the right this field.
I don't want that list to appear any more.
I thought it would be something to do with erasing a cache...so I tried to do a DNS flush as I describe, above, but nothing happened. I entered the two commands (one after the other) and all I got was a new line on which to enter another command.
My main goal is to get rid of that list in the insert hyperlink dialog box -- I don't like any such lists.
I am now, additionally, interested in why the DNS flush does not apparently work.
Thanks for any help you might be able to give.

Flushing DNS Cache

How do members here go about flushing their dns cache?

Maybe server is not updating? I've seen this. Flush cache, reload, and new updates are displayed as expected.

Flushing DNS

i am having trouble with flushing my DNS. i have edited nscd.conf so it says persistent hosts no. but i cant figure out how to start and stop the daemon

To shut it down, use this command:
# nscd -K
To start it back up, use this:
# nscd

Flushing dns in lion

when attempting to locate dns entries in terminal, i get the response, "Unable to get details from the cache node." Now when I flush the dns, which is my ultimate goal, there is no response. I would like to confirm that the flush has worked and also see what remains in the "buckets" and "entries" within this region. can anyone help me? i'm not a computer whiz... just trying wipe down the computer and make sure it runs smoothly/correctly. i'm using lion on a mbp. thanks.

You need to issue the following command in Terminal:
sudo killall -HUP mDNSResponder
You can check that the DNS cache has flushed by checking the system.log in Console, where the following should appear:
Mar 21 13:45:50 MacBook-Pro mDNSResponder[12]: SIGHUP: Purge cache

IPhone flush DNS

The IP address of my mai server changed about 18 hours ago but my iphone still can't resolve to the new address, nor does Safari find the new address for that matter. How can I flush the DNS in my iPhone or do I have to just wait and, if so, how long do you think it takes ATT/iPhone to resolve to the new address?

If you changed the IP-Adress in the DNS Server of your Domain, you have to wait till 24 hours.
To flush caches on your iPhone just reset it.

Post domain migration Outlook needs Flush dns intermittently

We have office in two cities X & Y, Y city is HO. Our entire DNS Server, Exchange server is in Z i.e. Head Quarters. Y city has file server, DC, Firewall. X & Y are connected via VPN tunnel. After our domain migration from abc.com to xyz.com only
X city few laptop users on wi-fi started getting issue of 'Outlook freeze- connection store/restore error' emails are stuck in outbox and not received. Only when we do ipconfig/release, renew, flushdns...it resolves the issue temporarily.
We found that issue might be on Wi-fi (Cisco SOHO - 3) we have changed the DNS setting of the WI-fi, pushed the DNS in host file, pushed in laptop settings, reduced the voltage of the wi-fi. Restarted the servers in Y city. Not sure if it is DNS or Wi-FI
issue. Still the problem persists. Please advice.

there is no easy way to find out the issue if it is related to client side configuration. as you already mentioned that it works after making DNS changes so the issue is somewhere at the Wi-Fi. it also depends how big is the mailbox, and if the outlook is
setup to cache mode or not.
For further troubleshooting I will use that same laptop on the wired network.
also if that Wi-Fi has Ethernet port I will connect a Hub/switch to it and then connect the laptop to the Ethernet. This is tell me if the issue with Wi-Fi on the laptop or the Wi-Fi Access Point.
Plus this thread should be moved to Outlook Forum
Where Technology Meets Talent

How do i flush dns on OS X 10.9.2

i need help how to flush dsn on osx 10.9.2

Get (free) Onyx for 10.9. You can do it with that.
Oops, wrong, thought it could do that.
In Terminal
sudo dscacheutil -flushcache;sudo killall -HUP mDNSResponder
You will be asked for your admin pword when you run this command (copy and paste) You won't see it in any form when you type it in.
Actually, had a better look. Onyx can do that. Close all browsers before doing this.

Used Mavericks DNS Flush Commands with 10.8.5

Mid 2011 Mac Book Air OS 10.8.5. In Terminal, I mistakenly used Maverick's DNS Flush commands dscacheutil -flushcache; sudo killall -HUP mDNSResponder.
I note that 10.8.5 only requires the second command.
Any problems with this blunder? Tks.

Lex,
Hmm, flushing DNS cache. With Safari on all of my Mac devices, I started having difficulty, initially on my iPad, accessing Zite and an internet radio, Tunein Radio Pro. After googling the error message "....cannot find the server", I put in the two 208....DNS numbers. I will now add the others you suggest. at some stage I read an article about flushing DNS caches, it suggesting using the Apple Store app. It seemed a good idea... The app is https://itunes.apple.com/us/app/clean-dns-cache-english/id628459184?mt=12. As a precaution I have loaded it only on my Mac Book Air, which is due for a clean install of Mavericks 10.9.2 when it is finalised. The app had a good review, and it would have been nice to have used it instead of using terminal, but I take your point that DNS caches are best left alone. Particularly for tyros! I will delete the app in due course. Thank you for the time and thought you have put in.
Cheers
Ken
Lower Hutt NZ
On 21/02/2014, at 1:28, Apple Support Communities Updates <[email protected]> wrote:
208.67.222.222

DNS not working for some computers

We have a SRP521W router and is set up with one SSID for wireless. In our office all the computers (5) can connect but only some may get on the internet. I have a laptop I am testing with and it will not connect, wired or wireless.
I found an article relating to flushing DNS, tried that, no luck.
I found another that said I should try setting my DNS to 208.67.222.222 and this worked, internet works fine.
I tried rebooting the DSL modem and router, tried many different things but am not a networking guru so I am just not sure why the DNS is not working for one computer but works for another, connected to same LAN or SSID.
Thanks,
Brad

Though what Don posted is one way to accomplish it, I never add anything to my DNS and it works fine. Windows DNS, in a default installation, will automatically forward to the root (.com, .edu, .gov, etc.). So I always just point my workstations
to my Domain Controller as their DNS and everything works just fine without any additional configuration.
Guess I'm one of those who won't even trust Google for sharing a DNS, particularly when I have never needed to set up any forwarders.
.:|:.:|:. tim

DNS problems with Snow Leopard. Can't upgrade to Mountain Lion either.

My Macbook Pro has been working quite well since I got it just over a year ago, until last week when I shut it down to go stay at my parents house. I turned it on when I got there and it automatically connected to the network because i go there often, however when I tried to open up a browser it would not work. I opened up several of the other browsers that I have but all of them kept saying they couldn’t connect to the server. I thought perhaps my dad had changed the router settings or something since last time I'd been there since the internet was working perfectly at my house only two hours previous. He said he hadn't changed anything and he was right, the internet worked perfectly through my sisters PC and through his ipad and my iphone. I later took it round to a friend’s house where it remembered his network too but still would not open addresses in the browser and when I finally got home to my house, I found I had the same problem. With every network I connected to I could update my apps and software, use my torrent client, ping certain IP's and connect with various other things that require internet connection, but the browser still never worked. After some research I came to the conclusion that it was most likely a DNS issue, I found this odd as I had not changed any sort of settings at all recently, except for turning the firewall on, which I turned off be3fore trying to troubleshoot. I have tried virtually everything that has been suggested on the internet like Flushing DNS cache, resetting PRAM, bringing my network to the top, turning airport on and off, connecting through ethernet, renewing DHCP lease, using google IP as DNS, checking for set proxies, repairing disk permissions, resetting router, checking router settings, the list goes on and on. The last thing I tried was to copy the com.apple.mDNSResponder.plist file then delete the old one and paste the new one back in, since then my Mac cannot connect to the internet in any of the previous ways.
After pulling my hair out for days, I thought the only option left was to upgrade to Mountain Lion, which I was planning on doing anyway. After downloading it though, I came to the option to select the disk I want to install to only to see my primary and only disk open my Mac coloured faintly and telling me that "This disk cannot be used to start up the computer". After more research I found that there were a few issues, none of which I have. I’ve never used time machine so there is no issue with any set partition for it, I have no other partitions on it at all either so I cannot use the resizing trick that seems to help most people. I would normally just backup all my data at this point and do a fresh install, but haven't got the funds to purchase a another TB at this point and I have over 650GB worth of valuable data on the Mac. Could someone pleeeease help me!?!?!

You cannot go to Mountain Lion, as stedman1 states.
But you can upgrade to Lion, possibly. See http://support.apple.com/kb/HT2404

"Back to my Mac isn't working properly because your DNS server isn't responding. Contact your ISP for an alternate DNS server address, and enter it in Network Preferences".

Hi, i am trying to setup back to my mac at home but I get the error "Back to my Mac isn't working properly because your DNS server isn't responding. Contact your ISP for an alternate DNS server address, and enter it in Network Preferences".
There is no documentation on how to solve this anywhere.
I have an Arris router set to bridged mode which is connected to a 5th generation airport extreme. I have tried using the google dns servers instead of the one assigned by the cable company in the AE but I still get the same error.
Any help would be much appreciated
Kenneth

New to BTMM, I got stung today with the silly DNS problem message. Solution:
1) Flush DNS cache with:
dscacheutil -flushcache;sudo killall -HUP mDNSResponder
2)System preferences > iCloud > untick BTMM then tick it again. The warning should have disappeared.
Edit #1
Apologies for the noise. The warning has come back
Edit #2
Just found out that BTMM is not compatible with double NAT. That's not helpful.
http://support.apple.com/kb/TS1208

External DNS not resolving SBS2011

Hi,
Hoping someone can help me out here. We have an SBS server that is no longer forwarding external DNS queries. We setup a secondary DNS server onsite so users would still be able to access web resources, but our primary DC only resolve
internal DNS. We have checked the forwarders on the servers (same on both), and one server resolves the forwarders, the other can't.
I have triedrestarting the DNS service, flushing DNS cache and a server restart. I've also checked forwarders and root hints, but can't see anything wrong in the configuration. Both servers have NIC set with the other DNS server as primary and itself
as secondary.
I tried running an nslookup which works when both DNS servers are polled, but fails on the SBS server if it tries to poll itself or an external DNS server.
Anyone have any ideas?
Thanks
Luke

Here is the results from my dcdiag test:
dcdiag /test:dns
Directory Server Diagnosis
Performing initial setup:
Trying to find home server...
Home Server = SERVER01
* Identified AD Forest.
Done gathering initial info.
Doing initial required tests
Testing server: Default-First-Site-Name\SERVER01
Starting test: Connectivity
......................... SERVER01 passed test Connectivity
Doing primary tests
Testing server: Default-First-Site-Name\SERVER01
Starting test: DNS
DNS Tests are running and not hung. Please wait a few minutes...
......................... SERVER01 passed test DNS
Running partition tests on : ForestDnsZones
Running partition tests on : DomainDnsZones
Running partition tests on : Schema
Running partition tests on : Configuration
Running partition tests on : domain
Running enterprise tests on : domain.com.au
Starting test: DNS
Test results for domain controllers:
DC: SERVER01.domain.com.au
Domain: domain.com.au
TEST: Forwarders/Root hints (Forw)
Error: All forwarders in the forwarder list are invalid.
Error: Both root hints and forwarders are not configured or
broken. Please make sure at least one of them works.
Summary of test results for DNS servers used by the above domain
controllers:
DNS server: 128.63.2.53 (h.root-servers.net.)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 128.63.2.53
DNS server: 128.8.10.90 (d.root-servers.net.)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 128.8.10.90
DNS server: 139.130.4.4 (<name unavailable>)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 139.130.4.4
DNS server: 139.134.5.51 (<name unavailable>)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 139.134.5.51
DNS server: 192.112.36.4 (g.root-servers.net.)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 192.112.36.4
DNS server: 192.203.230.10 (e.root-servers.net.)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 192.203.230.10
DNS server: 192.33.4.12 (c.root-servers.net.)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 192.33.4.12
DNS server: 192.36.148.17 (i.root-servers.net.)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 192.36.148.17
DNS server: 192.5.5.241 (f.root-servers.net.)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 192.5.5.241
DNS server: 193.0.14.129 (k.root-servers.net.)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 193.0.14.129
DNS server: 198.41.0.10 (j.root-servers.net.)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 198.41.0.10
DNS server: 198.41.0.4 (a.root-servers.net.)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 198.41.0.4
DNS server: 202.12.27.33 (m.root-servers.net.)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 202.12.27.33
DNS server: 203.50.2.71 (<name unavailable>)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 203.50.2.71
DNS server: 203.8.183.1 (<name unavailable>)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 203.8.183.1
DNS server: 208.67.220.220 (<name unavailable>)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 208.67.220.220
DNS server: 208.67.222.222 (<name unavailable>)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 208.67.222.222
DNS server: 209.244.0.3 (<name unavailable>)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 209.244.0.3
DNS server: 209.244.0.4 (<name unavailable>)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 209.244.0.4
DNS server: 210.23.129.34 (<name unavailable>)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 210.23.129.34
DNS server: 220.233.0.1 (<name unavailable>)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 220.233.0.1
DNS server: 220.233.0.2 (<name unavailable>)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 220.233.0.2
DNS server: 4.2.2.1 (<name unavailable>)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 4.2.2.1
DNS server: 4.2.2.2 (<name unavailable>)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 4.2.2.2
DNS server: 61.8.0.113 (<name unavailable>)
1 test failure on this DNS server
PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 61.8.0.113
Summary of DNS test results:
Auth Basc Forw Del Dyn RReg Ext
Domain: domain.com.au
SERVER01 PASS PASS FAIL PASS PASS PASS n/a
......................... domain.com.au failed test DNS
Hope this helps.
Thanks
Luke

Flush DNS

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