Resolving this issue involves increasing the timeout period available to VSS. The creation of a shadow copy has timed out. The shared restore point operation failed with error (0x81000101). The Event Viewer, by contrast, may show this or a similar message: Otherwise, the application could hang until restarted. In our logs, you’ll likely see this error message:Ī call to a VSS operation exceeded the time allotted, and was subsequently canceled.Įxplanation: By default, VSS operations are given 5 minutes to complete. By default, this period is five minutes, but system resource issues can stall the process and necessitate a longer timeout setting. VSS has a limited window within which it can generate a shadow copy.
You could include other accounts as well. For the Local System account, use the key NT Authority\SYSTEM.For the Network Service account, use the key NT Authority\NetworkService.Press Enter to add the Network Service to the list.Īlternatively, or in addition to, the Registry key HKLM\SYSTEM\CurrentControlSet\Services\VSS\VssAccessControl can be modified by adding subkeys as follows.If you are running as a named service account add the name of the account.For the Local System account, use the key SYSTEM.For the Network Service account, enter NETWORK SERVICE.Click Add and add an entry for the account the Backup Agent Service runs as (see Services to determine this).
Click Edit Default in the Access Permissions setting.Select the COM Security tab at the top of the My Computer Properties dialog box.Right-click My Computer and click Properties.In the left pane, expand Component Services.This is often caused by incorrect security settings in either the writer or requestor process. You might also see the following error in the Event Viewer: Log Name: Applicationĭescription: Volume Shadow Copy Service error: Unexpected error querying for the IVssWriterCallback interface. : The requested identifier does not correspond to a registered provider.It can occur on a number of different entries in our logs, such as: This error indicates a problem with the security settings for one or more VSS writers.
VSS AND SPP APPLICATION EVENT LOGS HOW TO
If the system writer is the only one missing, this Microsoft KB article has instructions on how to resolve the issue: IVss Writer Callback To fix this issue, you can try the instructions listed in this Microsoft KB article: Volume Shadow Copy Service error: Unexpected error calling routine CoCreateInstance. When checking the Event Viewer in these instances, you might see the following or a message similar to it: Log Name: Application Missing writers are usually caused by corrupted or missing Registry keys, and can be identified from information found (or more specifically, information not found) when using the vssadmin list writers command in a command prompt window.
Here are a few examples: Missing Writer(s)
VSS AND SPP APPLICATION EVENT LOGS WINDOWS
VSS is a very complex component of the Windows Operating System as a result, there is much that can go wrong with it. Many times, a quick Google search will result in a list of possible solutions, making this a valid resolution tactic. VSS problems can be seen in the Windows Event Viewer with the source descriptors of either VSS (in the Application log) or volsnap (in the System log). The primary tools for troubleshooting VSS issues are the Windows Event Viewer and the Command Prompt. It was first added to Windows with the release of Windows XP. Volume Shadow Copy is a technology that allows for snapshots of files or volumes currently in use by the operating system or applications, thus allowing them to be backed up without needing exclusive access to the source file or volume. The backup component of the Intronis EchoPlatform utilizes Microsoft’s Volume Shadow Copy (VSS) technology as part of its file duplication process.
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