Data Protector Client GUI (windows) cannot access DP server (on RHEL 8.7) via port 5565 - port in use

We have installed Data Protector on an RHEL 8.7 Linux server

We are using a MS Windows VM as a Windows GUI Client

From the Windows GUI Client, we start the Data Protector GUI and try to connect to our Data Protector server.

The connection fails with an error: 

 connect (2568, "node.domain" -> ""), 5565) failed 


We've noticed that the Data Protector GUI is attempting to connect to the Data Protector server via port 5565.

On the Data Protector server, port 5565 is in use by systemd

Is there a way to configure the DP GUI client to attempt to connect to the DP server via a different port?