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Blocking Internet radio

How can I block users from listening to radio stations and other media through HTTP? I use ISA and the only opened protocols are HTTP, HTTPS, FTP, and Gopher.

Is the Contents Group in ISA the solution? If yes, what type of files should I block?

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ISA servers are not my area of expertise, so I can offer only general advice. First, I would suggest that this is more than just a technical problem. Each user needs to sign and agree to an Acceptable Use Policy (AUP). This policy should clearly outline that Internet usage is only to be used for business purposes. It should also clearly define what the penalties are for violation of this policy.

Typically, Real Audio uses ports like 7070 to connect. The user can, however, configure the player to connect using HTTP only mode. So you could attempt to block all extension types associated with streaming music: WMS, WMZ, AIF, AIFF, SND, AVI, WMA, MP3, ASF, etc. You could also configure the server to block traffic by mime type. Check out it's a good site to obtain more information on specific ISA questions.

This was first published in December 2002

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