I think you need to add a DNS “A record” pointing to your server using “Simple Zone Editor” rather than using “Subdomains”, and be sure to delete the previously created subdomain in “Subdomains” first.
And what will happen if i need to add another site to this bench? Means i will need another IP or if i have to use the same address use a different port. Is this really how this is supposed to work? Could anyone kindly enlighten me?