Change of DNS server setting caused Exchange outages!

I am trying to google/bing my way through this, but here are the main points:
All remote Exchange servers had a) static IP addresses and b) were instructed to use DNS servers in Edmonton and Calgary
If WAN links dropped, they lost DNS
SOLUTION! Point remote servers to the domain controller in that location as the primary DNS server. WAN outage means Exchange still resolves names locally.
Well the day came and we add the local DNS server for each remote site as the primary DNS server at the top of "DNS server addresses, in order of use" portion of advanced TCP/IP settings dialogue box.
A reboot is performed
Voila! Exchange shits the bed! Hub transport servers in Edmonton and Calgary cannot resolve remote server names; as in no host(a) record exists for them anymore. And we have a 91 minute outage until the DNS is sorted out (ipconfig /registerdns run on each
server).
Has anyone encountered this or have some deep knowledge of DNS (relative to my own) that could at least throw out a theory as to why this might happen?

Hi, please issue Get-ExchangeServer -Identity "ServerName" -status | fl and check:
CurrentDomainControllers
CurrentGlobalCatalogs
CurrentConfigDomainController
The server must been linked to the wrong server. You can change that in powershell too.
Regards, Philippe
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Can't change DNS server setting on airport express

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Mark-
Did you get the AE to actually use the OpenDNS servers? I have the new AE and Airport Utility 6.3.1 and while I can enter the OpenDNS server settings (208.67.222.222 and 208.67.220.220), they don't work. When I use a Wi-Fi connected device (my iPhone, for example) it sill uses the Comcast DNS settings, totally ignoring the OpenDNS settings. I don't know when they stopped working, but they worked in the past. I've used the old Airport Utility as well (5.6) and it says the OpenDNS settings are active, but they aren't.
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From the terminal window, things like nslookup work (use the right dns server) but Safari doesn't. It still is using the original DNS server. I can stop and start safari and go to web pages it has not visited before and it still uses the old DNS server, so its not just pulling up cached pages.
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Yeah, but I am changing all the DHCP entries in the system and it still gets out. However, it is solved by updating the system config. I was just curious as to where it got its DHCP server info from when the system config was blank and resolv.conf was set to my DHCP server.

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Hi All,
This is a critical bug in Windows 7/Windows 2008 and Windows 2008 R2. Is there any way to get rid of it? I am planning for for a deployment with new DNS server IPs.
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Hello,
please see http://support.microsoft.com/kb/2520155/en-us
Best regards
Meinolf Weber
MVP, MCP, MCTS
Microsoft MVP - Directory Services
My Blog: http://msmvps.com/blogs/mweber/
Disclaimer: This posting is provided AS IS with no warranties or guarantees and confers no rights.

How do i change my dns server

how do i change my dns server

on Your iMac?
Best to do it on the router.
But if you insist:
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Network
Click on the network interface you want to adjust (Ethernet, AirPort)
Advanced button to the right
DNS tab.
good luck.

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Hi,
I'm a new BT broadband customer.
Like most, I have a house full of pcs and gadgets connecting to the Internet. Many belong to my children. Naturally, as a responsible parent, I want to do my utmost to limit their access to inappropriate content.
The basic first line of defence is obviously to have dns filtering.
However, my Home Hub 3 won't let me change the default dns gateway to some filtering service like OpenDNS, nor is there anything to suggest that BTs own dns service has this capability.
Can you please, as a matter of the greatest urgency (I believe that my children are currently able to access the most inappropriate content on their mobile devices), tell me how to get this in place.
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Many thanks for the replies on this thread - they are much appreciated, especially the email address.
As I said, I would regard dns filtering as the first line of defence. And a very necessary one, as my main concern is with my kids wifi connecting mobile devices.
What interests me about all this is that, as people have pointed out, there are ways to set the dns gateway per device. To my mind that completely undermines any argument for not allowing it to be changed on the HH.
Why might BT want to disable dns setting in the Home Hub?
i) Because they can then offer valuable dns based services, such as 404 redirection?
   But users can override the dns setting on each device!
ii) Because it is one less thing that could be miss-set, so cutting down support calls?
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iii) Because Government might ask us to ban access to certain sites and controlling the dns lookup would help us do this?
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TS3408 What on the Router or DNS server would cause this?

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Not all DNS severs prevent pre fetching.
Try this...
Open System Preferences > Network > Advanced > DNS
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Hi Darren,
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Forgive me if this has been asked before, I've been searching for an answer and can't seem to find one.
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Hi aavalenti,
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Nice to see someone from BT has addressed your issue
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My modem works just fine, but my airport extreme refuses to connect to the internet. I even reset it more than once, changed the DNS servers and still nothing. Help

Ok so recently we were having problems with our phone. We had to disconnect our modem in order to fix the phone lines and when that happened, our airpot extreme disconnected itself from the internet. No matter what I did i could not get it to connect back. I would power down the modem, I would reset the AE and nothing would happen.
I tried changing the DNS server and nothing happened. I always get the same messages in the airport utility app: No internet connection and no DNS server
Nothing I seem to do works. I do know for a fact though, that the problem is not the modem. I have connected it through ethernet to other devices and the internet has worked just fine.
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Since you feel good about having internet access up to your Airport, I would suggest as a next step checking your Airport's status light to see if it is giving any clues as to what may be going on. Below is some info on what the light can indicate
AirPort Express Status light sequences and what they indicate.
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Solid green - AirPort Express is on and working properly.
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I can not, however, get Profile Manager to open and connect in a browser using "server.me.private/profilemanager" from either the mini itself or from another mac on the nework. i can get a brower to connect to Profile Manager using "192.168.1.100/profilemanager" but after successfully logging in, the browser is redirected to a "server.me.private/..." address and shows connection failure.
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i'm definitely missing something here. it seems to me that the Time Capsule should remain the DNS Server for the network and forward "server.me.private" to "192.168.1.100". it is not doing this, and there are no options for setting this with Airport Utility.
some light on this subject would be greatly appreciated. Thanks very much!

thanks very much for your thoughts and reply, Thomas.
if i were to change the Time Capsule to use the Mini as the primary DNS server, is this where i'd do it in Airport Utility?
but it won't let me change the DNS Servers fields here. and if i can change the DNS Serever to my Mini's 192.168.1.100, what address should i keep for the second DNS Server?
Thanks again!

Change of DNS server setting caused Exchange outages!

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