Firewall locked you out of screensharing on OS X?

Sadly, I had this experience lately. Even though I had the firewall explicitly set to allow connections using Screen Sharing, for some reason my Mavericks OS X 10.9 server hiccuped and I couldn’t access it via screen sharing.

Here’s how I resolved my dilemma:

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Test whether outbound port is open on Mac OS X 10.9, 10.8, 10.7

Wondering if a certain outbound port on your Mac is open or closed? Here’s a way to test if that port is open using netcat via the command line in terminal, using a free service from portquiz.net:

From terminal, enter:

where 443 is the port number you want to test.

Control-c will kill net cat after you get the info you want.