Hi, everybody!! My first post in this forum. I have a technical question, and would appreciate if someone answers me. Cisco Pix525 with FOS 6.3. Three interfaces up, Inside, DMZ and Outside. I've got several servers, and one of them is serving multimedia via Windows media Server. This server has a local IP 192.168.X.Y and is translated through NAT into one public IP. So, pre-recorded videos, served by demand on unicast work great. But live videos, served via multicast don't work at all. At first I thought it could be a matter of ports (I don't know very well, because except the Pix, the network infrastructure is managed by another person, and I suspect that multicast is not enabled), so I opened everything, but it didn't work. Now I'm almost sure is a multicast issue. Can someone lend me hand? I promise to invite you to some beer if you ever come to Spain. :D