Connect to openvpn past enterprise firewall

The proper way is to do this :

1. Setup openvpn to use tcp instead of udp on any port (1194 is default)
2. Setup port forwarding to forward external 443 port to internal 1194 port.
3. If the web browser on client side is using a proxy setup the openvpn client to use the proxy server for connection.
4. Setup client to use tcp and port 443.

Then connect.

Reference: http://superuser.com/questions/303198/connect-to-openvpn-past-enterprise-firewall