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Windows Server 2008 R2 Thread, Servers Can't Resolve Own Hostnames or Network in Technical; Hello all, Got a rather puzzling and urgent issue. On Wednesday night we had a powercut which took out our ...
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    Servers Can't Resolve Own Hostnames or Network

    Hello all,

    Got a rather puzzling and urgent issue. On Wednesday night we had a powercut which took out our Primary Domain Controller (win2k8r2). We're back up and running on the secondary server (now primary) running server 2003. We also have a new win 2k8 r2 server back up with the same configuration as before but this has for now been left as a secondary dc. It has the exact same setup as before.

    We have a fair few servers but we are only having issues with 2 of them, both running win 2k8 r2, one running our SQL server and the other our Exchange 2010 server. Both of these servers have gone mad and can't resolve any hostnames including it's own or even localhost! On the exchange server I've tried to reset the TCP/IP stack and had a specialist looking at it too. Under nslookup it says Default Server: Unknown. Because of the hostname resolution issues the servers cant talk to AD or the internet which is obviously stopping both sql and exchange from starting back up.

    Wondered if anyone else had come across this and might help point us in the right direction?

    Neil
    Last edited by neilherbertuk; 3rd August 2012 at 12:37 PM.

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    mac_shinobi's Avatar
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    Not sure if this is an option but restore from the last successful backup before it went south ?

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    Quote Originally Posted by mac_shinobi View Post
    Not sure if this is an option but restore from the last successful backup before it went south ?
    That is an option but I really would like to keep that as a last resort!

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    So the problem is purely resolving the names, it can ping addresses etc if you provide it with an IP?

    If so I assume you have changed all the DNS servers with no luck, and assuming pinging "localhost" also doesn't work then it seems like the DNS client on the servers has gone haywire, you have tried the in built repair utility to check the windows files to?

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    Hi Achandler

    Yes we can ping IP addresses without an issue it's purely down to hostname resolution / dns. Like our Exchange server won't come back online as the Active Directory Topology service wont start. In the eventlog it lists the 2 domain controllers but says it cant find them. Same as websites, it cant resolve domain names. Yet you can connect to the mailserver using it's hostname from another computer (rdp) and get the owa login box through the browser.

    I haven't yet tried an sfc but that will be on the cards shortly.

    Neil

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    and you have definitely checked that they are pointing to the right DNS on the NICs right?

    I only ask because I have seen people not able to ping localhost but able to ping everything else via hostname.
    Last edited by Achandler; 3rd August 2012 at 12:53 PM.

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    1. What does the 2080 event say in the app log on the Exch server?
    2. What version of Exch?
    3. As a test can you stick in a host entry for one GC in-site and test?
    4. How did you try to reset the IP stack?
    5. When you do an ipconfig /all does it show the correct DNS servers?

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    mac_shinobi (3rd August 2012)

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    Yes DNS is set correctly but it can not ping any hostname at all! I've just put one of the servers onto dhcp to see if it could resolve anything without luck.

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    I would reset the stack again. Then check that the ipconfig is all correct. Have you tried flushing DNS as well to make sure you are definitely getting a clean copy again.

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    Quote Originally Posted by neilherbertuk View Post
    Yes DNS is set correctly but it can not ping any hostname at all! I've just put one of the servers onto dhcp to see if it could resolve anything without luck.
    What about the other questions?

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    Well he has Exchange 2010, he mentioned earlier.

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    Quote Originally Posted by Achandler View Post
    Well he has Exchange 2010, he mentioned earlier.
    Detailed info like SP level UR etc..makes it easier when troubleshooting any issue when Exch is installed, many issues depending on the level you're on. However, in this case it seems more on a DNS issue however knowing the env always helps me.

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    what happens on an NSLOOKUP?

    rOB

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    Sorry sukh, didn't see your reply.

    1) Not getting a 2080 error (though the specialist who has been looking did clear the logs about half hour ago)
    2) As I get an initalisation error when loading the Exchange Console I can only tell you its Exchange 2010
    4) I reset the tcp/ip stack using the netsh command "netsh int ip reset"
    5) Yes the dns ip addresses are manually set. ipconfig /all does show the correct settings.

    As for 3 not sure how to do that. My boss who should know how to do that is on holiday! So by myself!

    As for enviroment its windows 2008 r2 standard with sp1

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    Also try a telnet to port 53 on the DNS server.

    you should get a cursor rather than a "connecting"



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