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I have little snitch installed and every time I resume my macbook pro gs-loc.apple.com on port 443 wants to connect. I'm thinking it's to find your location so that iCloud can display it. the exec is called locationd. I pretty sure that my guess is right. I just wanted to see what the community thought.

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up vote 7 down vote accepted

Yep, it’s Location Services. The location is updated on a regular interval, or when an app requests it.

I worked it out while using Little Snitch, just like you. As there was a loc in the domain name, I figured it would be Location Services.

To confirm, I turned off Location Services, and sure enough, locationd shut down and no connections to gs-loc were made. To confirm again, I blocked gs-loc, and Location Services stopped working.

From: discussions.apple.com

Locationd is a daemon that provides location services for OS X's "Core Location". This uses skyhook technology to figure out your mac's location (using WiFi). It's the same system used by the iPod Touch, and is also used by the iPhone (The iPhone also uses cell tower triangulation and GPS)

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It would greatly improve the answer if you could add a reference for this (if any exists at all). –  patrix Sep 10 '12 at 14:33
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Well this is a pretty hidden thing and I found it out while using Little Snitch, just like the OP. As there was a “loc” in the domain name, I figured it would be Location Services. To confirm, I turned off Location Services, and sure enough, locationd shut down and no connections to gs-loc were made. To confirm again, I blocked gs-loc, and Location Services stopped working. –  duci9y Sep 10 '12 at 15:10
    
thanks for your answer. helped out greatly. –  Throdne Sep 10 '12 at 20:33
    
You’re welcome. –  duci9y Sep 11 '12 at 8:43
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