The OVPN client has a functionality called Connect using TCP 443, which means that the connection to our servers will use TCP as the protocol and 443 as the port number. The default setting is UDP and port 1194. However, this setting only takes effect when connecting using the standard service. If you connect using an add-on, and the checkbox is selected, you will still connect using UDP
The Connect using TCP 443 feature can be activated/inactivated from the Account tab in the client.