My call router shows following errors .
1. connectivity with duplex partner has been lostdue to failure of the private network or duplex router is out of service.
2.TCP connection to Application Gateway Host has been broken.
3.Error receiving data from Application Gateway Host.
4.The external database has disconnected from the Application Gateway ( ID = 5011 ). Routing may be impacted.
5.Heartbeat fail limit reached - closing the connection. Application Gateway ID = 5011.
please explain how do i trouble shoot this or where do i start from.