How to find Ports Required for Deployed Angular App?

We deployed an Angular App to IIS server. We used the deploy using zip method. It all works ok however we found we had to open a port that we didn't expect to.
This App connects to an SQL server so we expect ports for that to be needed.
In radzen there is an angular port and server port in the application settings which we believe we used 8000 for angular port and 5000 for .net core application port.
How can we verify what our deployed application is configured to use for ports?
We assume the port values are in some configuration files in our deployed site?

The server and client ports are only used during development. When you deploy the application it works on the port your server listens to (usually 80 or 443).