A thread that I keep seeing in the newsgroups is “How do I block IM clients on my network with ISA Server?”.
Most IM and P2P clients today can be configured to use port 80, or to use the same proxy settings as IE, or can have their own proxy settings, so blocking the applications native protocol does not help much when you need to allow your users to surf the Internet. Remember ISA does not allow traffic to pass unless you create a rule to allow it. ISA Server allows you to block HTTP traffic based upon the applications unique signature. By blocking traffic based upon its signature you can block specific traffic, while still allowing your users to surf the Internet.
Follow the following steps to block traffic with a HTTP signature.
Signatures are defined on a per rule basis and can be defined on access rules or Web publishing rules.
ISA Server User Education
How to block Skype in ISA Server
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I wants to block attachment for yahoo,hotmail,gmail users. How can I achieve this?
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How can I block your freedom with ISA 2004 server?
Hi my name is phanos I am working on isa server 2004 and I would like to now if there is a way to pout an exception word on isa server signature like *essex* from the word *sex*
In regard to "How can I block your freedom with ISA 2004 server?", some workaround are out there.
Create an access rule in which all outbound traffic to freedom server are disallowed.
Regular update to the url list is required.