Symptoms
When you use Microsoft Skype for Business Server 2015 Persistent Chat Server, you may receive the following event:
Time: Date/Time
ID: 53530
Level: Error
Source: LS Persistent Chat Server
Machine: ServerName
Message: The Persistent Chat database connection was lost.
The Skype for Business Server 2015, Persistent Chat lost connection to the database using connection string:
Data Source=sql.contoso.com;Initial Catalog=mgc;Integrated Security=SSPI;
Cause: An unexpected error occurred that caused the loss of the Persistent Chat database connection.
Resolution:
Check the state of the database.
Cause
This issue occurs because the procProcessADUpdates stored procedure takes more than 30 seconds to run. Default Skype for Business Server 2015 Persistent Chat Server time-out is 30 seconds so that the stored procedure execution will be aborted.
Resolution
To fix this issue, install the December 2017 cumulative update 6.0.9319.510 for Skype for Business Server 2015, core components.
