Why does the video on the Windows Media Player temporarily pause when I play content from the Internet?
In some cases, firewalls block Universal Datagram Protocol (UDP) traffic, which is the protocol required to play streaming content. In those cases, the Player is forced to use the HTTP/TCP protocol, which causes buffering and pauses when there is network congestion. To find out whether the Player is pausing (buffering) due to network congestion, you can compare the bandwidth the Player is currently using against the available bandwidth. On the View menu, click Statistics, and then click the Advanced tab.