C:\Program Files\Resource Kit>dcdiag /s:win2ksvr /a

Doing initial required tests

   Testing server: Default-First-Site-Name\WIN2KSVR

      Starting test: Connectivity

            *** Warning: could not confirm the identity of this server in

               the directory versus the names returned by DNS servers.

               If there are problems accessing this directory server then

               you may need to check that this server is correctly registered

               with DNS

         ......................... WIN2KSVR passed test Connectivity

   Testing server: Default-First-Site-Name\LAB2

      Starting test: Connectivity

         [LAB2] LDAP search failed with error 58,

         The specified server cannot perform the requested operation..

         ***Error: The machine, LAB2 could not be contacted, because of a bad

         net  response. Check to make sure that this machine is a Domain

         Controller.

         ......................... LAB2 failed test Connectivity