System State Backups Fail and Event ID 8194 is Logged

• This article is for Windows only

System State backups fail with the error application writer's data is not available. This behavior is caused by incorrect or missing COM access permissions. The correct permissions must be set to prevent this error.

The following event is logged in the Windows Application Event logs:

      Log Name:      Application
      Source:        VSS
      Date:          5/9/2014 3:13:51 AM
      Event ID:      8194
      Task Category: None
      Level:         Error
      Keywords:      Classic
      User:          N/A
      Computer:      CARB-ILLYA-W2012
      Description:
      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.

To resolve this issue, follow the steps below:

1. Launch Component Services from Administrative Tools in the Control Panel.
   1. This can be done by typing dcomcnfg into the search box after clicking the Start Menu.
2. In the left portion of the window, expand the Component Services section and then expand the Computers section.
3. Right-click on My Computer (listed in the Computers section) and select Properties from the pop-up menu.
4. Click the COM Security tab. The My Computer Properties dialog will appear.
5. Click the Edit Default... button in the Access Permissions section. The Access Permission dialog will appear.
6. Under the Group or user names box, click the Add... button.
7. Type Network Service into the box and click OK.
8. Click OK on both the Access Permission and My Computer Properties dialogs to close them.
9. Restart the computer.