This is often caused by incorrect security settings in either the writer or requestor process.Įxamination of the binary data for event 8194 indicates that ‘NT AUTHORITY\NETWORK SERVICE’ is account receiving the access denied error:Įvent 8194 is caused by the inability of one or more VSS system writers to communicate with the backup application VSS requesting process via the COM calls exposed in the IVssWriterCallback interface. Volume Shadow Copy Service error: Unexpected error querying for the IVssWriterCallback interface. The VSS error manifests as the event 8194 appearing in the event log of the PC that the backup attempt is run on: More information for these platforms can be found at Note that the same issue also affects Windows Storage Server 2008 R2 Essentials and Windows Small Business Server 2011 Essentials. The first two issues were dealt with quickly by a hotfix for Home Server 2011.
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