Collector is unable to connect to server :
2017-10-24 10:21:54 SEVERE [ActiveCollectorSessionInitializer] authentication with server not successful
2017-10-24 10:21:54 WARNING [SessionHandshakeRequest] unsuccessful session handshake for session - session initialization was canceled locally [session=<server-ip>:Plain:Deflate:Collector]
2017-10-24 10:21:54 WARNING [Collector] unable to connect to server - created session was null
2017-10-24 10:21:54 INFO [Collector] Server[<server-ip>] has been disconnected - reconnecting in 15s
Solved! Go to Solution.
Looking into this deeper,
[ActiveCollectorSessionInitializer] authentication with server not successful
It was an authentication issue, looking at the other collectors, it seems as though we were missing the authstring="" within collector.config.xml.
When using the AppMon client to change the port from 6699 to 6998, the client removed/defaulted the authstring that was set.
Once that was set to the correct string, we were able to have the collector talk to the AppMon Server.