If you are having older version of Real Player and not able to view the webcast or on-demand video then follow the guidelines given below -

Setting Your Player to Receive Data through HTTP only:

1. Select Preferences from the View menu.
2. Click the Transport tab in the Preferences windows.
3. Click the Use Specified Transports box.
4. Click the Specify Transports button.
5. Check the Use HTTP only  option and make sure that the other options are unselected.
6. Click the OK button in the Specify Transports window.
7. Click the OK button in the Preferences window.
8. Click the Play button again.

Note: Though some  versions of the Player should automatically detect if you cannot receive data through UDP and switch to TCP. In some cases, you may need to force the Player to default to TCP, using above instructions. For more help you can visit the Real Network web site at 

http://service.real.com/help/errors/

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