Please help to configure Jitsi VideoBridge 1.3

Hello, I installed Jitsi VideoBridge 1.3 on Windows Server 2008 R2, I have an external IP address and domain name, I go to a conference with the domain name and see myself but when connect other I see window but can not see the image in it.

Hi, I opened ports 50000-60000 UDP but nothing happened, I unplugged firewall and all working, Tell please how to enable recording?