Hello. There is a company, the Internet is through a proxy server, a separate machine with UserGate on Board. UserGate need to configure a port to view the webinar via flash. Port 1935 for Real Time Messaging Protocol. In fact, the proxy stream webinar works fine. And on the client machines during the test ports on the website of webinars when checking writes that the ports are closed on the proxy of course says that the port 1935 is open. I understand it to properly forward ports in UserGate. Those who have experienced similar please tell me.