Over the last week replication has been failing on our W2003 domain to one of our 3 DC’s. The event log is showing event 13508 which indicates it is a FRS or DNS issue. All 3 DC’s are global catalog servers and the particular server not replicating also holds all the FSMO roles. When I try to check the stats of those roles it shows ERROR as the role holder instead of the server name. Running dcdiag everything passes except FRSevent which says that there are warning evens within the last 24 hours after the SYSVOL has been shared. Failing SYSVOL replication problems may cause Group Policy problems. Any ides what might be causing this issue? All three DC’s are W2003 SP2.