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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.


This problem occurs because the records in the RGS database table are corrupted when you manually change the UserSid value.


To fix this problem, install the following cumulative updates:

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