$ 0 0 open a new query window and start a long query open a second query use the second window to kill the session id of the first one switch to the first session - it should now have the status disconnected in the status bar try to use the SSMSBoost prefered connection combo box to switch to another database on the same server it will fail without error message, since you are executing now only a USE <database> statement -> check the connection status and reconnect, if disconnected, before the USE Image may be NSFW. Clik here to view.