I am in a network with clients, a proxy, and a router/gateway. The proxy is set by default in every client, and only allows the TCP ports 80 and 443 and the UDP port 53.
I need to be able to reach another services (like SSH) through the gateway. I've tried a VPN(openVPN running on port 443) but the connection failed(i don't really know the reason).
What can be done? May i somehow connect directly to the gateway(as it is in the same network)?