After upgrading to DLP 15.8, the Incident Persister service will not start.
The tomcat log has this entry;
[com.vontu.incidenthandler.IncidentPersister.start] Unexpected error starting Incident Persister.
org.springframework.boot.web.embedded.tomcat.ConnectorStartFailedException: Connector configured to listen on port 9000 failed to start
In 15.8 the Incident Persister added some new spring boot features that, by default, included an embedded tomcat service which was bound to port 9000.
Because another application already was bound to port 9000 the Incident Persister couldn't start.
Another possible resolution is to reboot the server to clear any hung sessions on port 9000.
Running "netstat -anb" from the command prompt may show sessions on port 9000.
However, no service is listening on this port as the Incident Persister will not start.