If you’re on a local area network (LAN) which is attached to the Internet, and are unable to play clips from remote Web sites, it’s possible that your company’s firewall is preventing the stream from reaching you. Users can receive live and on-demand audio and video from the Internet without exposing their company’s network to security risks.
Firewalls create barriers in order to prevent unauthorized access to a network. Think of the Internet as a series of hallways. Firewalls are the security doors through which some people (i.e. data) may pass and others may not.
RealSystem content usually passes through these barriers without trouble, but sometimes it is necessary to change your configuration settings. With the proper configuration settings, you can enjoy RealAudio and RealVideo.
If your computer is behind a firewall, please see RealNetworks’ firewall page for more information: http://service.real.com/firewall.