How to do address transfer

Hi,

I setup a remote desktop already, http://1.1.1.1/rdweb, works in internal network.

I think it should have a way to access it like http://1.1.1.1:9999, use port# instead of /RDWEB.

If it works, then I could open firewall port forwarding 9999 to internal ip 1.1.1.1 port 9999, then I could access remote desktop from anywhere .

How to do transfer from 1.1.1.1/rdweb to 1.1.1.1:9999?

Thanks,

ITdragon