Windows Server 2012 R2 VPN

Hello,

I'm hoping someone can help me out or at least point to the right direction. I successfully set up VPN on my server using port 443. My only problem now is hat port 443 is being used on my remote software that has an SSL. Both the remote software and VPN work fine, but I want to have my VPN connection on it own sub domain such as vpn.domain.com like I have with my remote software. I tried changing it to port 5000 and 8443 and I kept getting a connection refusal error(no connection could be made because the target machine actively refused it)on the client machine. Any help would be greatly appreciated.

Thank you,