Added additional config parameter called "database_connection_timeout"
which indicates timeout in seconds for database connection.

The same timeout used by SQL server ADO.NET driver when transaction commit or rollback occurs.

The default value is 15 seconds. You can increase it to a higher value if load on DB is high and timeout execptions occurs during transaction commit or rollback.

Also this option can be specified directly in ADO.NET connection string.
It is called "Connection Timeout" or "Timeout"