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APPLIES TO: 
2013 2016 2019 Subscription Edition 
SharePoint in Microsoft 365
Rule Name: Expired sessions are not being deleted from the ASP.NET Session State database.
Summary: If expired sessions are not deleted, the server that hosts the ASP.NET Session State database may run out of disk space and the SharePoint farm may cease to function.
Cause: One or more of the following might be causing this:
The SQL Server Agent service was stopped.
SQL Server Express is installed.
Important
You cannot run the SQL Server Agent service on an instance of SQL Server Express.
Resolution: Start the SQL Server Agent service
Verify that the user account that is performing this procedure is a member of the Administrators group on the database server that is hosting the ASP.NET Session State database.
In SQL Server Configuration Manger, start the SQL Server Agent service.