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Theoretically, could I block a service running on port x by starting some other service on x with it? Would it return two responses or one big mixed response?

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No, you can't. You can only bind one service/process to a given port at the same time.

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So will the OS stop you? –  tehwalris Sep 25 '12 at 20:08
Yes, it will tell you something like "Port x is already in use". –  Sven Sep 25 '12 at 20:38
Ok, thanks a lot for your answers :) –  tehwalris Sep 25 '12 at 21:04

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