We upgraded our TRAIN environment to 16.1.1 from 16.0.3 patch 1.
Finally once the upgrade completed, we started the services and found that one of the app service (app2) says 'Started' but the logs show otherwise.
SEVERE: Failed to create server shutdown socket on address [localhost] and port [23793] (base port [23793] and offset [0])
java.net.BindException: Address already in use (Bind failed)
Release : 16.1.1
This is caused by a known defect, DE704650 causing a bind address conflict when cloning the service