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Cannot connect on port 3725 and job stuck creating snapshot

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Source is Windows 2003 SP1 or a later version.


When attempting to replicate a workload the job fails with this error:
The process cannot access the file because it is being used by another process.
Or the job enters a Recoverable Error state, stating that there is a failure to connect on port 3725.  Investigation into the "Sending Files" step of the diagnostics shows that the job is hung attempting to create the VSS snapshot.
There are no VSS errors logged in the source event logs and the following command run on the source workload does not complete, or takes a very long time to complete:
vssadmin list writers


The resolution for this issue is to reboot the source workload.


The "vssadmin list writers" command not completing, along with the job hanging at creating the snapshot, indicates a serious issue with VSS.  This behaviour is most common among workloads that have high uptimes; the longer a Windows workload stays online without rebooting, the more likely it is for VSS to simply stop working correctly. 

Additional Information

If rebooting doesn't resolve the issue with the replication, it should still allow "vssadmin list writers" to complete; this information can be used to determine the status of VSS on the source.  If errors continue, it may be necessary to contact Microsoft for assistance in resolving VSS issues before the replication can continue successfully.


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  • Document ID:7011815
  • Creation Date:21-FEB-13
  • Modified Date:22-FEB-13
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