No access to nohost.me from the outside

Indeed it seems to trigger other issues…by accessing my domain eg xxx.com:PORT seems to be connecting but nothing is happening after that…
I followed this: Change port of NGINGX (443-> 4443) : l'API ne répond pas (Erreur : 0 error) guide to do this.

I will give it another shot, but it would be great to have a guide where do change what since as i describe above, I am behind a VPN client in my router and i dont mind putting the :PORTNUMBER if i have to access the server from the outside…

Basically what i want is for the :PORTNUMBER to be just after my domain name … (i think) in every redirect the server does…

Any other input is of course welcome. Thank you for your help.