DCdiag – Got error while checking LDAP and RPC connectivity.

When running DCdiag on an Windows 2008 server i received the error:

Message 0x621 not found.

         Got error while checking LDAP and RPC connectivity. Please check your

         firewall settings.

         ……………………. DC01 failed test Connectivity

After checking my firewall I when ‘t on to Google to ask, I found some suggestions to check the cables, switch and network teaming. After dissolving the network teaming on the server the server passed the connectivity test, another solution could be to update to the latest Nic teaming software.

Testing server: Default-First-Site-Name\DC01

      Starting test: Connectivity

         ……………………. DC01 passed test Connectivity

Microsoft has now released a patch to correct this problem. You can find more info here http://support.microsoft.com/kb/978387

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