Change ports used by sap gui

Hi all,

I have two PCs running an SAP instance each at home and I'm using my public IP address in order to access the systems through SAP GUI remotely.

The problem is that I can only access one PC since I configured the same port numbers on my router (port forwarding)

So, I have to change the ports used by SAP GUI (3200, 3300 and 3900) in one of the computers to be able to access both using public IP address.

So please tell me if it is possible to change those three ports and how to do so.

Thanks in advance