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How can an application detect that a desktop or personal firewall is blocking a port or binary image?

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QUESTION POSED ON: 22 November 2004
How can an application detect that a desktop or personal firewall is blocking a port or binary image?

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Well, it can try to connect over different channels and ports. If all methods fail, then the assumption should be that you are either blocked or not connected to the Internet. Separating between those two is harder to do.

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