Subdomain forwarding with mask leads to white page

[Bog]

I host a discourse site on my server and point a port of my public IP to this site with IP fire. Then in Godaddy, I forward a sub-domain to MYIP:PORT with mask but get a white page. I tested it without mask and it works well. Does anyone have some idea? 

[Nate]

Don't use masking.  It is an outdated browser 'hack' that has been depreciated in web standards.

[Bog]

But we do not want users to see the raw ip address and the port to the server.  How can we achieve that without masking?

[Bog]

OK, I found this link which may help us taking care of masking on the server side - 

https://webmasters.stackexchange.com/questions/110997/bluehost-forward-subdomain-with-making

Please kindly let us know if we are on the right track.

[Nate · Accepted solution]

Yes, if you configure the 'server' to accept requests for the domain.  That would be the proper way to point a domain, no masking needed.