After you change a protection group in Microsoft System Center 2012 Data Protection Manager (DPM 2012), the DPM service crashes with Event ID 917 and the console shuts down. This affects only protection groups that are configured for long-term protection (for example, groups that are configured for tape backup), especially if those groups contain data sources that are SQL AlwaysOn databases.
For more details and a work around, please see the following:
KB2905631 - The DPM service crashes with Event ID 917 after you change a protection group (http://support.microsoft.com/kb/2905631)
J.C. Hornbeck | Solution Asset PM | Microsoft GBS Management and Security Division
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I have read the KB, but how do you make any changes to the protection groups while you can't even get into DPM. I will try in the morning when no Jobs are running and see if the MS KB does help.