Try a different bandwidth and perhaps even a different player. Make sure that you have your video card configured properly and that you have the most recent video drivers available. Because video is so bandwidth intensive, it is easy for any point of this process to become temporarily overwhelmed. This is the equivalent of getting a telephone busy signal. A webcast Event that was archived as now disappeared.
Archives are often available for a limited time only.
At the end of the rights period, we remove it from the system and it will no longer be available for viewing. I want to watch a webcast Event behind a Firewall. This is a configuration issue and you need to visit the Real or Microsoft support sections.