When connecting to the application server several times it gives an error as in the subject and then after a few trials it goes through. Intermittent failures on connection. when trying to join domain i failed with errors indicating that DNS was not resolving the domain name. Or Domain name server not found. This indicated DNS resolution failure. Upon trying multiple times i managed to resolve and worked. Just like what happened for connecting to the server when i check the event log i found this Found error message: "The DNS server has encountered a critical error from the Active Directory. Check that the Active Directory is functioning properly. The extended error debug information (which may be empty) is "000020E3: SvcErr: DSID-031B061F, problem 5002 (UNAVAILABLE), data 0". The event data contains the error." in the event log. plse help me to to find out what is the reason for this failure. My dns run windows 2000 and application server is windows 2003 server