How to configure ports in UserGate?

Question

Computer networks

Hello. There is an enterprise, the Internet receives through a proxy server, a separate machine with UserGate on board. You need to configure the port on the usergate to view the webinar via flash. Port 1935 for Real Time Messaging Protocol. On the proxy server itself, the webinar broadcast works fine. And on client machines, when testing ports on the webinar site, when checking, it says that the ports are closed, on the proxy it naturally says that port 1935 is open. As I understand it, you need to correctly configure port forwarding in UserGate. Who faced similar prompt please.