RE: DCDIAG Failure FRSEVENT
Looking at the port, it seems there might be replication problem with the Sysvol. That is something that you need to take case before installing Exchange, as they can be an indication of larger issues. You can also check the logs for more information on the errors and try to narrow it down to the server's that are having this issue. There is a tool from MS to troubleshoot FRS problems, download it from the below links:
http://www.microsoft.com/technet/pro...9a0db2a56.mspx
FRSDIAG tool -
http://www.microsoft.com/downloads/d...displaylang=en