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SQL Server connection pooling keeps connections open for a set timeout period before closing them and allowing new ones to be reopened. This is done for performance reasons.
However, it appears that the Tomcat component fails to release idle or sleeping connections to the database . We can force Java to disconnect older idle connections once it has been idle for too long. You can find each of the jdbc connections in this file: [SBM]\Common\tomcat\server\default\conf\context.xml.
SBM 10.x database upgrade to SBM 11.x gives error "Failed to upgrade Orchestration Engine database. Connection to the Application Engine server has timed out."