Avamar: SharePoint Backup Failed with Backend client mismatch detected

Summary: This knowledge article provides a solution for SharePoint backup failures due to a client mismatch error.

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.
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Symptoms

  • SharePoint backup fails with the following error:
avmossvss Error <0000>: The back-end plug-in on client SISPxxx (128.1.xx.xx) terminated with errorcode 10007: miscellaneous error.
avmossvss Error <0000>: The back-end plug-in on client SISPxxx (128.1.xx.xx) terminated with errorcode 10007: miscellaneous error.
avmossvss Error <0000>: The back-end plug-in on client SISPxxx (128.1.xx.xx) terminated with errorcode 10007: miscellaneous error.
 
  • From the backup log in the shared var directory on the SQL client, the following events may be displayed:    
[mossvss_assist]  Checking local hostname: CLCLU001-ISPxxx with received hostname: SISPxxx
    avmossvss Error <18823>: Backend client mismatch detected. If this is a cluster environment make sure that the cluster agent is correctly configured.

Cause

  • The cluster client is configured as a SQL cluster client instead of SharePoint.
  • The local hostname is different than the received hostname.

Resolution

  • Reconfigure the Backup Agent of the cluster client using the Cluster client configuration tool with the SharePoint plugin chosen instead of the SQL plugin. 

 

  • Go to the local var folder on the SQL backend client, which is usually the C:\Program Files\avs\var directory.
    • Using Notepad or another text editor, create the avmossvss.cmd file.
    • Add the following flag to map the correct hostname:
--static-hostname-list=<<SQL Alias name>>(local hostname of SQL back-end)

Example:

--static-hostname-list= SISProd(CLCLU001-ISProd)

Affected Products

Avamar, Avamar Plug-in for SharePoint VSS
Article Properties
Article Number: 000201804
Article Type: Solution
Last Modified: 12 يناير 2026
Version:  3
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