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nate155 Level 1 Level 1

My macbook stopped connecting to the internet out of the blue.  I am still on the same wireless network as the other computers and can share files.  However, all other devices still connect fine using the same network.  I've gone through the deleting/ recreating the airport in System Preferences and even tried deleting the system configuration folder and restarting.  No results.  Any ideas?

Solved by BDAqua on Jan 7, 2012 1:07 PM Solved
As a matter of fact, I do have PeerGuardian installed, but it's not been running.In my research I found hundreds of cases of PeerGuardian being the sole cause of this exact same symptom. Uninstalling it was the only solution I found at all for this problem. Is it listed in Sys Pref>Accounts>Login Items?
  • BDAqua Level 10 Level 10

    Some things to try...


    Make a New Location, Using network locations in Mac OS X ...



  • nate155 Level 1 Level 1

    Thanks for the quick response.  I tried creating a new locaion with the same results as before.  It's strange, all the settings are practically identical (except the last ending number in the IPv4 address, which is normal) with the macbook pro sitting next to it but will not connect.  However, they are both visible on the network.


    One additional clue:  I use the istat pro widget, it shows me in the network, but the part: "Ext: Updating..." (I am guessing that means the External IP..?) remains constant and on the other computer it says "Unknown"


    Still stumped...

  • BDAqua Level 10 Level 10

    Open Network Utility>Ping tab & see if you can ping & get pongs from...


  • nate155 Level 1 Level 1

    Sent 10 Pings.



    ex. PING ( 56 data bytes


    10 packets transmitted, 10 packets received, 0.0% packet loss

    round-trip min/avg/stddev = 82.730/100.129/133.219/14.418 ms




    So I guess this means that it is PINGing, though am too ignorant in the subject to know what that tells us.

  • BDAqua Level 10 Level 10

    Yep Nate, it is on the Internet, so it seems likely one of two problems.


    Now pate that number into a Browser's URL bar & hit enter... anything like Google show up?


    Open System Preferences>Network>Configure>Proxies Tab, make sure none are set, like for HTTP & HTTPS .


    10.5/10.6 instructions, System Preferences>choose interface>Advanced>Proxies Tab, make sure none are set, like for HTTP & HTTPS.

  • nate155 Level 1 Level 1

    Going to that IP address continued the whole "can not display page".  I hadn't checked those settings before, but none of the proxies are set.


    This is so weird.  I've had that computer for over 2 years and never had this happen before...

  • BDAqua Level 10 Level 10

    To find out if it's system wide or user specific, try this...

    Open System Preferences>Accounts, unlock the lock, click on the little plus icon, make a new admin account, log out & into the new account.


    Does browsing work in that account?

  • nate155 Level 1 Level 1

    Good suggestion, I had never thought of that.  But no luck.  Still no browsing.

  • BDAqua Level 10 Level 10

    Well, let's go back to Network Utility?Trace route tab & try that IP, then try & see if there's some difference, or at least see how far IPwise the named one goes.

  • Texas Mac Man Level 8 Level 8

    Try this - Turn Off your MB. Then turn Off the wireless router & then back On. Now boot your MB. Hopefully it will see the WiFi.


     Cheers, Tom 

  • nate155 Level 1 Level 1

    @Texas Mac Mac.  Tried it several times before, bet tried it again just encase...exactly as you described, but no luck. Thanks for the suggestion.

  • nate155 Level 1 Level 1

    BDAqua - So I tried the trace route...


    traceroute to (, 64 hops max, 52 byte packets

    traceroute: sendto: No route to host

       1 traceroute: wrote 52 chars, ret=-1



    So I'm guessing thats bad.


    -Thanks again for going through all this with me

  • BDAqua Level 10 Level 10

    Yep, that means it's not getting anywhere. So it seems ICMP packets are being passed, but not UDP packets


    Open Terminal and paste this in...


    traceroute -I


    Press return.


    Have we tried turning off any Firewall?

  • nate155 Level 1 Level 1

    Pretty much the same result.


    traceroute: sendto: No route to host

       1 traceroute: wrote 52 chars, ret=-1




    Firewall is off (has been).

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