@MrGlasspoole
Yes, I guess it is blocked in these networks.
You may setup your OpenVPN server to listen on port 443 TCP to avoid blocking.
However, TCP has a worse performance than UDP. So you may also run two servers as I do. One is listening on 1194 UDP, the other is listening on 587 TCP, thinking port 587 is mostly allowed, since it is used on some mail servers.
Then you can configure your client to connect to the second server if the primary isn't reachable.