Why do you want to use port 400 ?
That is not exactly a standard port.

was only an example.

What is saying that when you use the vpn the port is closed ?

PortQryUI was saying NOT LISTENING.

What application is it you are talking about ?

I’d rather not.

Note:
You can’t test what ports are open/closed from the system itself.
You need to do it from the outside.

both my pc’s had vpns so i guess it was from the outside, also i was using the WAN IP,

tested that theory with this other service and it tested perfectly, 1= LISTENING 2=NOT LISTENING.

many thanks for the help guys i really appreciate it,

i strongly believe the changes must be made with an updated client but avast don’t seem too bothered about the vpn side of things,

with no customer support and no help from the devs or admin will things ever change for the better?

cheers guys (–_–)