JErnesti
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Q: Upgraded to OS X lion and now I cannot connect to the Internet.  Wifi or hard wired. Any ideas?

After upgrading to lion I cannot connect to the Internet anymore. I have tried wifi and hard wired. Network preferences shows that I have an IP address and my DNS is listing correctly but still cannot connect. I can't even access my routers IP address to get into configuration. Any ideas?

MacBook Pro, Mac OS X (10.7)

Posted on Jul 20, 2011 9:32 AM

by JErnesti,Solvedanswer
JErnesti JErnesti
Level 1 (0 points)
A:

I uninstalled avast and now my connections work great.

Posted on Jul 20, 2011 11:47 AM

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JErnesti

Q: Upgraded to OS X lion and now I cannot connect to the Internet.  Wifi or hard wired. Any ideas?

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  • by Ralf Uttenthaler.,

    Ralf Uttenthaler. Ralf Uttenthaler. Jul 23, 2011 2:13 PM in response to JErnesti
    Level 1 (13 points)
    Applications
    Jul 23, 2011 2:13 PM in response to JErnesti

    Same Problem to me with my 17" MBP MID 2009.

     

    After upgrading to Lion and a restart I had no Network Connection an only Spotlight Icon in the upper right corner of the menu bar (the Finder menues were also there)

     

    The solution to my problem was, to delete the network prefernces by typing:

     

    sudo rm /Library/Preferences/SystemConfiguration/preferences.plist

     

    After a reboot, all worked like a charm. The only thing was, I had to reconstruct some network settings.

  • by Budaman1010,

    Budaman1010 Budaman1010 Jul 24, 2011 7:47 AM in response to JErnesti
    Level 1 (0 points)
    Jul 24, 2011 7:47 AM in response to JErnesti

    I have no problems with my admin account, but my users can not connect. talked to apple support and was told to either let the user accounts have admin right or wait for an update. Have any ideas?

  • by joannabk85,

    joannabk85 joannabk85 Jul 24, 2011 12:34 PM in response to Necrite
    Level 1 (0 points)
    Jul 24, 2011 12:34 PM in response to Necrite

    I had the same problem - I turned off the firewall and now my problem is fixed. THANKS.

  • by PeteyV,

    PeteyV PeteyV Aug 5, 2011 1:24 PM in response to wifiguru
    Level 1 (0 points)
    Aug 5, 2011 1:24 PM in response to wifiguru

    wifiguru: I had this issue and followed the steps by typing in sudo mv... and sudo rm... commands. However, when I tried to run the sudo rm command it came back with no such file or directory. However, everything works now. I booted up several times and I now have internet connection. So thanks much!!

     

    I have one question, even though I have the firewall back turned back on, is still virtually disabled by renaming that file???

  • by GolfLeo,

    GolfLeo GolfLeo Aug 13, 2011 12:50 AM in response to PeteyV
    Level 1 (0 points)
    Aug 13, 2011 12:50 AM in response to PeteyV

    I have managed to recreate the error (I have been error free for nearly a week) and then go back to normal operations again.

     

    What I did was:

    Error mode: set Channel to AUTO

    Working mode: set Channel fixed to 5.

     

     

    pls try it and verify yourself, but make sure you have a cable to connect your Mac to your APE, because when you can't get a wifi connection you can't change the channel either.

  • by bonniefromdallas,

    bonniefromdallas bonniefromdallas Sep 7, 2011 3:12 PM in response to Superfletch
    Level 1 (0 points)
    Sep 7, 2011 3:12 PM in response to Superfletch

    Superfletch was the correct answer for me! Don't remove anything. Just reboot everything!

     

    Thanks dude!

  • by bandejapaisa,

    bandejapaisa bandejapaisa Oct 24, 2011 5:04 PM in response to JErnesti
    Level 1 (0 points)
    Oct 24, 2011 5:04 PM in response to JErnesti

    tried all the suggestions from every site, and even tried some of my own.

     

    Sorted it by uninstalling Cisco AnyConnect !! Luckily, I don't need to use that anymore anyway.....

  • by npcw,

    npcw npcw Jan 3, 2012 5:26 AM in response to JErnesti
    Level 1 (0 points)
    Jan 3, 2012 5:26 AM in response to JErnesti

    Lion disappointed me. I choose to upgrade simply to use the iCloud service, to syn my contacts, bookmark, calendar etc. The wifi problem disturbed me for so long. After numerous attempts, I figured out inputting the TCP/IP and DNS maunally fixed the problems. It works for me, hope it works for those who still annyoned by Lion.

     

     

     

    tcp ip dns.jpg

  • by aromond,

    aromond aromond Oct 22, 2014 7:09 AM in response to npcw
    Level 1 (0 points)
    Oct 22, 2014 7:09 AM in response to npcw

    I had the same issue. I found that there was a Search Domain of home under the DNS settings. After removing this my connection worked fine.

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