Unexpected error querying for the IVssWriterCallback interface. hr = 0x80070005, Access is denied.

Mar 21, 2013 at 11:24 PM
I've been using AlphaVSS with success in a WPF app which requires administration access. When I moved the same code into a Windows Service which runs as LocalSystem account, I get the following error:

Volume Shadow Copy Service error: Unexpected error querying for the IVssWriterCallback interface. hr = 0x80070005, Access is denied.
. This is often caused by incorrect security settings in either the writer or requestor process.

Operation:
Gathering Writer Data

Context:
Writer Class Id: {e8132975-6f93-4464-a53e-1050253ae220}
Writer Name: System Writer
Writer Instance ID: {3adc436f-3306-4d4f-8d23-60ed5f05d5a6}

Any idea why?