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I have 2 windows 2008 servers that are linked by a VPN connection which should be replicating files by dfs. This however is not working correctly and I am hoping someone can help diagnose the problems.

Running dcdiag on one server gives the following errors

Doing initial required tests

   Testing server: DE2\DE1-CORE2
      Starting test: Connectivity
         The host f4515c4c-433e-4e80-b14a-dadff6e7a657._msdcs.domain.local
         could not be resolved to an IP address. Check the DNS server, DHCP,
         server name, etc.
         Got error while checking LDAP and RPC connectivity. Please check your
         firewall settings.
         ......................... DE1-CORE2 failed test Connectivity

Doing primary tests

   Testing server: DE2\DE1-CORE2
      Skipping all tests, because server DE1-CORE2 is not responding to
      directory service requests.

This sounds like I have communication problems on this server, does any one suggest what I need to do to track down the problem and fix it

Many thanks for your help

share|improve this question
Should be able to check your DNS server to see what the IP should be for the host f4515c4c-433e-4e80-b14a-dadff6e7a657._msdcs.domain.local Should be able to see if you can ping it. If you can ping it, then you have a DNS issue and not a networking issue. –  Nixphoe May 13 '11 at 15:45
Do you have any specific event id's in the event logs? Have this setup ever worked before? –  redknight May 13 '11 at 16:55
more interesting than a "ping" would be an "nslookup f4515c4c-433e-4e80-b14a-dadff6e7a657._msdcs.domain.local". The netdiag output might be interesting as well, netdiag /fix might help set DNS records which are missing for one reason or the other (see support.microsoft.com/kb/219289). –  the-wabbit May 14 '11 at 13:15

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