: Domain forwarding and the port you're trying to access have quite a little in common. While DNS servers are supposed to propagate you domain name, your DNS provider must point the requests

@Alves908

Domain forwarding and the port you're trying to access have quite a little in common. While DNS servers are supposed to propagate you domain name, your DNS provider must point the requests to the IP address of the server your site is hosted at; IIS/Apache/other server should actually listen to a port supplied in request.
Yes, you can forward subdomain to specific listened port. Please refer to specific server configuration manuals for details (IIS; Apache)
All the http requests (via Http 1.0 or 1.1 protocols) are captured by http handler of web server (HTTP.SYS for IIS for example); all ftp requests are captured by ftp handler, hence you can freely use subdomains for ftp access.

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