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 Necrite,

    Necrite Necrite Jul 20, 2011 10:05 PM in response to wifiguru
    Level 1 (0 points)
    Jul 20, 2011 10:05 PM in response to wifiguru

    No it did not get a dhcp address. Right when you replied I figured it out.

    Mac's built in firewall seemed to be the cause. I disabled it, restarted and now I can connect wired & wireless. I turned it back on and restarted again and am still able to connect. Seems there is maybe a bug in the upgrade when carrying over the firewall settings. Thank you for all your help.

  • by Necrite,

    Necrite Necrite Jul 20, 2011 10:15 PM in response to Necrite
    Level 1 (0 points)
    Jul 20, 2011 10:15 PM in response to Necrite

    Ok, for some reason I wanted to reboot again. With the Mac built in firewall "on" i'm not able to connect again. I turned it off and rebooted and now am able to connect again. I did complete shutdowns 3 more times and am still able to connect. Basicaly turn the firewall off and leave it off until Apple patches it.

  • by wifiguru,

    wifiguru wifiguru Jul 20, 2011 10:28 PM in response to Necrite
    Level 2 (240 points)
    Jul 20, 2011 10:28 PM in response to Necrite

    Try this:

    Backup this file in /Library/Preferences and the delete it.

     

    Command 1:

    sudo mv  /Library/Preferences/com.apple.alf.plist  /Library/Preferences/com.apple.alf.plist.orig

     

    Command 2

    sudo rm  /Library/Preferences/com.apple.alf.plist

     

    Now reboot your machine and then turn the firewall ON after a reboot. Then reboot a couple times and test if everything works.

  • by Necrite,

    Necrite Necrite Jul 20, 2011 10:36 PM in response to wifiguru
    Level 1 (0 points)
    Jul 20, 2011 10:36 PM in response to wifiguru

    File doesn't exist to move. I did a PRAM reset some hours ago. That could be why.

  • by octamm,

    octamm octamm Jul 20, 2011 10:40 PM in response to JErnesti
    Level 1 (0 points)
    Jul 20, 2011 10:40 PM in response to JErnesti

    ok, airport says i am connected and chrome seems to work fine, also mail, but the app store, twitter, facebox and stuff ike that just wont connect, anyone knows what is happenning?

  • by Necrite,

    Necrite Necrite Jul 20, 2011 10:44 PM in response to octamm
    Level 1 (0 points)
    Jul 20, 2011 10:44 PM in response to octamm

    What have you done so far? From what I read removing AVAST seems to fix most poeple. For me, it was disabling the built in Mac firewall.

  • by octamm,

    octamm octamm Jul 20, 2011 10:57 PM in response to Necrite
    Level 1 (0 points)
    Jul 20, 2011 10:57 PM in response to Necrite

    well i dont have avast or any other antivirus. i tried disabling the built in firewall and nothing.

     

    i dont really have a problem with chrome or safari, anything else just wont work, i tried searching for upgrades and i couldnt connect either. i have read a bit about dns and dhcp but everything seems to work just fine. I dont have a clue on what is going on at this point. when i try the assistant it says that there was a change and askes for my wep again, and the same message keeps appearing, anyone with this same problem?

  • by Necrite,

    Necrite Necrite Jul 20, 2011 10:59 PM in response to octamm
    Level 1 (0 points)
    Jul 20, 2011 10:59 PM in response to octamm

    The only thing that I could suggest might be a DNS cache flush.

    dscacheutil -flushcache

  • by octamm,

    octamm octamm Jul 20, 2011 11:06 PM in response to Necrite
    Level 1 (0 points)
    Jul 20, 2011 11:06 PM in response to Necrite

    well i flushed every system cache and it seems to be working now, dont really know what happened, mabe the apps didnt accpet the change from snow leo's airport to the new one or something. Thaks a lot, hope i wont be aving problems again.

  • by Necrite,

    Necrite Necrite Jul 20, 2011 11:09 PM in response to octamm
    Level 1 (0 points)
    Jul 20, 2011 11:09 PM in response to octamm

    No problem. Good luck.

  • by octamm,

    octamm octamm Jul 20, 2011 11:11 PM in response to octamm
    Level 1 (0 points)
    Jul 20, 2011 11:11 PM in response to octamm

    the problem seems to be the built-in firewall, cause as soon as i turn it on it stops working again. am i supposed to leave it off? is someone else having this problem?

  • by Necrite,

    Necrite Necrite Jul 20, 2011 11:13 PM in response to octamm
    Level 1 (0 points)
    Jul 20, 2011 11:13 PM in response to octamm

    I left mine off. When I enable it again I get DHCP issues and DNS issues.

  • by octamm,

    octamm octamm Jul 20, 2011 11:13 PM in response to octamm
    Level 1 (0 points)
    Jul 20, 2011 11:13 PM in response to octamm

    ok i just saw u have the same problem and that im supposed to leave it off, sorry for the trouble, wasnt paying attention. lol

  • by Necrite,

    Necrite Necrite Jul 20, 2011 11:15 PM in response to octamm
    Level 1 (0 points)
    Jul 20, 2011 11:15 PM in response to octamm

    It's all good. I'm just glad what I found was able to help someone else.

  • by wifiguru,

    wifiguru wifiguru Jul 21, 2011 12:27 AM in response to octamm
    Level 2 (240 points)
    Jul 21, 2011 12:27 AM in response to octamm

    octamm, try this:

    Backup this file in /Library/Preferences and the delete it.

     

    Command 1:

    sudo mv  /Library/Preferences/com.apple.alf.plist  /Library/Preferences/com.apple.alf.plist.orig

     

    Command 2

    sudo rm  /Library/Preferences/com.apple.alf.plist

     

    Now reboot your machine and then turn the firewall ON after a reboot. Then reboot a couple times and test if everything works.

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