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One is often asked by clients how to block a particular application, most notably one that includes Instant Messaging (IM), such as Facebook, Skype, MSN etc. But the problem with blocking an application is that it will often find a way through a firewall - either using 'Tunnelling' software, or by searching through all available ports until it finds one open (a problem that can be solved through security systems such as Network Box). So securing the application, and creating user policies on how and when to use it, may be a more effective solution than simply blocking IM altogether.
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