If a network connection that USRP2M17 is running over is interrupted, or the reflector it's linked to is restarted, the reflector no longer recognises the connection and (correctly) issues a NAK, but USRP2M17 still believes it's connected. Only way to restore connectivity is to restart USrP2M17, once the network or server issue is resolved, or after restarting the reflector.
If a network connection that USRP2M17 is running over is interrupted, or the reflector it's linked to is restarted, the reflector no longer recognises the connection and (correctly) issues a NAK, but USRP2M17 still believes it's connected. Only way to restore connectivity is to restart USrP2M17, once the network or server issue is resolved, or after restarting the reflector.