[john roberts]

Hi
When you say assigned port number who assigned it?

Did you get the port number off your vpn providers personal support page relating to your account?

What operating system are you using, I have found the Windows firewall is a pain in the butt.

It has been said the client software's default port no eg 6881 etc is blocked by some ISP's

try

http://canyouseeme.org/ with your vpn in use

https://ipleak.net/

https://www.dnsleaktest.com/

Have your tried another client? I use qbittorrent on Linux Mint and love it.

good luck