[arm-allstar] Erratic ability to connect, or not

[Jim Aspinwall No1PC]

Running:  Asterisk 1.4.23-pre.hamvoip-V1.5.3-17-app_rpt-0.327-10/01/2017
Node properly registered with AllStar.  
Only occasionally accepts connection from other nodes, iaxRPT clients, AllStar webtransceiver.  

In the CLI I can see inbound attempts, not completing to announcing the node connection, but it's not clear what is accepted or rejected, it just drops at the 'calling' end.

What logs/entries on the node might provide some status of the node connection attempts and failures?