Beginning in Symantec Data Loss Prevention 15.0, the Monitor Controller service (Detection Server Controller service in version 15.1 and later) includes an embedded version of Apache Tomcat that uses port 8080 in listening mode, enabling communication between Enforce Server processes related to DLP appliance management. The Tomcat process is bound to the Enforce Server localhost. If any other application binds to this port, then the service will fail to start.
You can confirm this connection in the following logs in the VontuMonitorController.log (15.0) or SymantecDLPDetectionServerController.log (15.1 and later) file:
INFO: Tomcat initialized with port(s): 8080 (http) Mar 13, 2018 2:53:58 PM org.apache.catalina.core.StandardService startInternal INFO: Starting service Tomcat Mar 13, 2018 2:53:58 PM org.apache.catalina.core.StandardEngine startInternal INFO: Starting Servlet Engine: Apache Tomcat/8.0.48
If port 8080 is unavailable for the Monitor Controller/Detection Server Controller, the following error is logged to VontuMonitorController.log (15.0) or SymantecDLPDetectionServerController.log (15.1 and later) file during startup:
Embedded servlet container failed to start. Port 8080 was already in use.