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BugZero found this defect 4746 days ago.
The error is coming from the Windows guest. RPC is not functioning correctly.
Before running a job, make sure that the VeeamVssSupport service is not running on the guest VM(s); stop the service manually if it is running. Sometimes this error is caused by a firewall disconnecting the TCP connection between the two machines. Make sure you have configured dynamic port allocation: http://support.microsoft.com/kb/154596