I am having issues viewing Microsoft webcasts via their On Demand Partner site. These webcasts use LiveMeeting to provide the hosting and I have been having issues with the video dropping out while the webcast is displaying "A Shared Desktop". During this blackout, the audio continues as normal and non-desktop sharing slides will continue to display. The LiveMeeting Tech support says that I must ensure that their Servers and the required TCP/UDP ports are allowed access. I have found the settings in OneCare to open the specific ports and protocols but where are the settings to allow only certain IP addresses to access those ports?