(My setup is: clean "Mountain Lion" install (with restore from Time Machine) and Airport Express base station. I checked the power management settings (command pmset) and defaults but couldn't find anything. The OS X v10.7.5 Supplemental Update is recommended for all users running OS X Lion v10.7. (These two don't relate exactly to disconnects after locking but more generally to connectivity problems in "Mountain Lion".)Īs a last resort, a clean install (restoring applications/settings from Time Machine) might help. Some claim that Apple WiFi equipment spares them from suffering this issue (maybe because an old, possibly incompatible base station was replaced?) ( and ).Ĭhange MTU size to prevent dropped connections (also ). Lock the screen differently, for instance with a 3rd party program (, applies to Mac OS X 10.7.5) (I use hot corners for that). Although I own a similar MacBook Pro that runs 10.8.2 I can count myself fortunate not to suffer this issue.Ĭonsequently the list below is rather a compilation of possible fixes (some may even seem absurd or just plain obvious) than tested recommendations:
Other people's Macs are misbehaving in a similar way, read for example this and this. Typical output is: AirPort preferences for en1: The Apple Support Downloads page is most useful for finding software for more recent older Macs, particularly anything that is running a version of Mac OS X, even if it’s no longer a supported or updated system software release, like for Macs running Mac OS X Tiger 10.4 or Mac OS X Snow Leopard 10.6.5.
To list the interface settings, run in Terminal. When WiFi is the only active interface (that is, no Ethernet cable attached). You can get it with this Terminal command: ifconfig | grep -B 6 'status: active' | head -n 1 | cut -d : -f 1 Where en1 is the name of your Mac's WiFi interface. EDIT: Please see John's answer above, which basically says to open Terminal and run: cd /System/Library/PrivateFrameworks/amework/Versions/Current/Resources
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