> The likes of GRC.COM <http://grc.com/> make you think that any port not blocked... is bad. > I wondered why if nothing there
Because there is a difference between a closed port and a filtered port. Deny vs drop. The less of a fingerprint you offer to attackers, the better. It's security by obscurity to an extent, but even a response from a closed port can give away clues about the software, OS and network stack that's running.
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