Replication Hangs
Commerce Server 2009 R2 Staging (CSS) will try to recover from a network communication failure for up to 30 minutes. This gives the impression of a hung condition. To make sure that no other issues are involved, do the following:
Ping the target to check the communications or issue a nondestructive content deployment command on it. Wait for staging to recover.
Check the Performance Monitor to see if files are being sent or are in a recovery state.
Check the event reports from the Microsoft Management Console (MMC) for detailed information.