SSL VPN on port 80 (doesn't connect in TCP)?

Hello everyone,

I'm a newbie in "firewalling" so my question may seem a little silly.

Because from any protected network the port 8443 is blocked, I have changed the default SSL VPN port to 80 for ease of access from anywhere.

When the protocol is set to UDP the connection to the VPN is established successfully while it doesn't work in TCP (loop restarting).

Of course TCP is required for bypass most of firewall on port 80 ^^

Does anyone have an idea?

Connection log from the VPN Client:

Many Thanks.