This is the HTTP(S) port of the Controller. This is the same port that you use to access the Splunk AppDynamics browser-based user interface.

If agent.controller.ssl.enabled is true, specify the HTTPS port of the Controller; otherwise, specify the HTTP port. See agent.controller.ssl.enabled.

For on-premises installations, port 8090 for HTTP and port 8181 for HTTPS are the defaults.

This setting is required.