Symptoms
In a Microsoft Skype for Business Server 2015 environment, if you manually change a value in the UserSid column in the dbo.Agents table of the rgsconfig database, the Skype for Business Server Response Group service (RGS) crashes.
Cause
This problem occurs because the records in the RGS database table are corrupted when you manually change the UserSid value.
Resolution
To fix this problem, install the following cumulative updates:
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March 2016 cumulative update 6.0.9319.235 for Skype for Business Server 2015, Response Group Service
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March 2016 cumulative update 6.0.9319.235 for Skype for Business Server 2015, core components
