Excel Services crashes continuously

You may experience Excel Services crashing continuously after applying a patch to SharePoint 2013.

The issue can be resolved by following these steps:


1. Make sure that the account running Excel Services is part of the groups WSS_WPG and WSS_ADMIN_WPG on the SharePoint servers running Excel Services.


2. Open the SharePoint Management Shell and run the following command:

psconfig -cmd secureresources


3. Run iisreset in the command prompt. This will reset the registry permissions so that the WSS_WPG and WSS_ADMIN_WPG groups have read access to the following registry key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office Server\15.0


Excel Services should now run successfully without crashing.

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