To start with, what’s a firewall? Simply stated, it’s an application that closes all or specific internet protocol (IP) ports on your internet connection, allowing only incoming connections that are necessary to the regular operation of your Mac. Here’s how to do the same if you’re feeling as paranoid as I was… To do this, I watched the OS X firewall log to see what was happening each time the symptoms occurred. But after a few days of perplexing symptoms I decided I’d better see whether someone or something was actually attempting an attack. Now, I’m one of those people who always enables the OS X firewall, so the chances of a hacker attack actually occurring were probably pretty slim. Before the holidays, I was running into an odd problem with my new iMac, and when I mean “odd”, I mean that it was acting as if someone was trying to access my Mac from somewhere else.
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