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WiFi with Exclamation mark after upgraded to Mountain Lion

The light is green, under network, and the connection works even though I have an exclamation mark on the wifi sign. Airplay doesn't work, on my Apple TV. Already tried to switch everything off/on but nothing changed. How can I fix it?

MacBook Pro with Retina display, OS X Mountain Lion, I love it!

Posted on Jul 28, 2012 8:56 AM

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Question marked as Top-ranking reply

Posted on Jul 28, 2012 3:05 PM

Backup these 2 files:

/Library/Preferences/SystemConfiguration/NetworkInterfaces.plist

/Library/Preferences/SystemConfiguration/preferences.plist


Then delete these 2 files and reboot. If you upload these 2 files someplace I can take a look if something was wrong in there.

13 replies

WiFi with Exclamation mark after upgraded to Mountain Lion

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