Fixing OS X Mountain Lion wireless connection issues

“OS X Mountain Lion has been a painless upgrade for most users, but there are a fair amount of people experiencing some unusual wireless connectivity problems and issues,” OS X Daily reports. “Mainly, the wi-fi connection seems to drop at random, or the Mac simply won’t stay connected to a wireless network for long. Sometimes it automatically reconnects and sometimes it doesn’t.”

“If you’re experiencing these wifi issues you’re not alone, the good news is that we have a few solutions that appear to resolve the connection problems in Mountain Lion,” OS X Daily reports. “For best results, try combining both of these tips.”

Fixing OS X Mountain Lion wireless connection issues:
#1: Add a New Network Location & Renew DHCP
#2: Change MTU Size to Prevent Dropped Connections

Complete instructions in the full article here.

MacDailyNews Take: Are you experiencing wireless connection issues with OS X Mountain Lion? If so, did either or both of the fixes above correct your issue(s)? Or do you have another fix you’d like to share? Let us know below!


  1. Indeed on both my MBP 15 RD and MBA 13. I adjusted the MTU on my Cisco Router to 1850 in lieu of 1500 and of course changed channel and so far things have stabilized.

    1. When they say “adjust the MTU” they mean down…not up.

      Never increase it higher than 1500…never.

      Adjusted it to 1492…or lower…1360, or even down to 1200 if you connect through VPN’s.(VPN clients should do this for you)

      It is better to send two packets than to try and sen one that gets split into two anyway.

      Good luck networking…

  2. I use OSX 10.7.4 and have this very same problem and have found the only solution is to disconnect the router, modem, airport and cable provider, wait…….hook everything back up and try again. Sometimes this works, sometimes it does not.

  3. No issue whatsoever. I have two machines running ML and both connect and stay connected. Off topic but my new MPB retina is blindingly fast. I was stunned at how quickly it installed ML after the download. Likewise, when I installed copies of stuff I bought from the App Store, the machine just flew through the installations. My local ISP treats most of its clients demands for bandwidth like a flight of Watermelons as seen from the other side of a sphincter but once past that limitation, the machine itself just flies.

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