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DNS MMC Snap in wont connect to server

Posted on 2014-03-04
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Last Modified: 2014-03-05
Hello,

For the last week I have been unable to use the DNS MMC snap in to connect to any of the DNS servers in our domain.  

When trying to connect I get the error:

"Cannot contact the DNS Server

The specified DNS server cannot be contacted. Some possible reasons include: The dns server may not be running, there may be network problems or the computer associated with the specified name or IP address could not be found."

There is no problem with DNS, it is working and replicating to all other DNS servers. I get this error when trying to connect to ANY of the 10 DNS servers in the domain, and this error occurs from any PC in the domain using any domain login.

I can use DNS MMC snap in on the DNS server themselves, but not from any pc. The servers are all win 2003, and I am connecting from windows 7. Its not been a problem until recently. The only possible things that have happened that may have affected it are that the FSMO roles were moved to another DC, and the AD schema has been prepped to allow windows 2008 DC's.

Any ideas would be much appreciated!
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Question by:umbroIT
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3 Comments
 
LVL 13

Expert Comment

by:Santosh Gupta
ID: 39902980
Hi,

Just for make sure. Please check

1. check that you are trying from domain machine.
2. run "nslookup domainname" from PC
3. Try to connect DNS with both IP, Host name and FQDN as well.
4. telnet port 135 and check if able to connect with DNS server.
5. are you able to access DNS server console from any other DNS server.
6. Try to use MMC as "Run As Administor"
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Author Comment

by:umbroIT
ID: 39903260
Thanks, checked all that, all OK. DNS seems fine, just remote access to the DNS servers via MMC is not working.

Currently looking into if remote access to DNS has been disabled by the AD prep for 2008. Is that possible?
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LVL 13

Accepted Solution

by:
Santosh Gupta earned 2000 total points
ID: 39903312
Hi,

take the registry backup of

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DNS\Parameters

and Try this...

        Locate and then click the following registry subkey:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DNS\Parameters
    On the Edit menu, point to New, and then click DWORD Value.
    In the New Value #1 box, type RpcProtocol, and then press ENTER.
    Right-click RpcProtocol, and then click Modify.
check the value from 1 to 4.
    then click OK.
    Exit Registry Editor, and then restart the DNS Server service. To restart the DNS Server service, follow these steps:
        Click Start, click Run, type cmd, and then click OK.
        At the command prompt, type the following command, and then press ENTER:
        net stop dns && net start dns


not sure about "DNS has been disabled by the AD prep for 2008"
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