By default UCP listens on port 443. To change the port UCP is listening on, navigate in the Web UI to Admin Settings > Cluster Configuration > Controller Port. This setting was introduced in UCP 2.0.0 and can only be changed through the Web UI. Applying a change to this setting will result in UCP controllers restarting and may briefly interrupt UCP availability. If using a load balancer for UCP, the load balancer will also need to be reconfigured to accommodate this change.