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Level 1

4 points

No wifi connection after installing Mountain Lion HELP!!

So there it is... It appears as though I am connected to the wifi network, but in reality there is no connection and I'm offline. That's the only way I connect to the Internet so I'm kind of screwed. Any ideas on how to fix this? Here's what I've tried so far:

-disconnect and reboot the router

-turn off and on the AirPort

-delete and add the network connection

-restart the computer

Nothing works :-(

I have a late 2011 17" MBP if that makes any difference.

MacBook Pro, OS X Mountain Lion

Posted on Jul 25, 2012 3:07 PM

53 replies

katk23 Author

Level 1

4 points

Jul 26, 2012 6:01 AM in response to Shootist007

You're absolutely right! Here is what I did to make it work all over again:

1) I determined that connection to VPN is the cause of Wifi not working. - When Disconnected - Wifi worked perfectly fine; when Connected - Wifi appeared to be working, but wasn't connecting to the Internet

2) I went into Network Preferences/Advanced

3) Clicked on the DNS tab

4) Added two new OpenDNS servers: 208.67.222.222 & 208.67.220.220 by pressing the '+' button

FYI - OpenDNS is the DNS service HMA Pro VPN is using automatically. If you're not a HMA VPN user and want to use OpenDNS, you have to sign up for it.

5) I clicked OK and then Apply

6) I connected to VPN and voila - everything works fine. Wifi works also while VPN is disconnected.

Darctic

Level 1

0 points

Jul 26, 2012 6:15 AM in response to katk23

In finder press cmd + shift + g a box will pop up.

Enter this exact thing: /library/preferences/systemconfiguration

Now take that systemconfiguration folder and Delete it! It will prompt you to provide your password, delete and empty the trash, now press the button to restart your computer, and it should work again.

katk23 Author

Level 1

4 points

Jul 26, 2012 6:17 AM in response to Darctic

I've tried that, but it didn't work for me. Then again, I did not empty the trash so maybe that was the reason why :/

Darctic

Level 1

0 points

Jul 26, 2012 7:16 AM in response to katk23

It is, it has to be completely gone from the computer, in order for it to make new files :)

Reinstalling lion now, as I got it to work doing my trick , though I had to switch to another part of my network in order for it to work.

Jul 26, 2012 10:44 AM in response to Darctic

I did that, and it still didn't work.

Jul 26, 2012 11:29 AM in response to Brian Gavin

I'm trying to reinstall the OS again, but the download for the extra components is saying it has another 15 hours to go. So much for me getting any work done today. Thanks Apple. You corrected Lion aka Vista by giving us Windows 98.

Shootist007

Level 6

16,703 points

Jul 26, 2012 11:46 AM in response to Brian Gavin

When and If you get the download to work you REALLY need to save those downloaded files and make your own ML Install USB thumb drive.

I just used the one I created yesterday with the download from the MAS, after I saved them to another partition and used the newest version of LionDiskMaker (great little program for making the thumb drive), to do another clean install on an external USB 2 HDD and it took all of 30-35 minutes from start to finish.

gsspike

Level 1

10 points

Jul 26, 2012 2:35 PM in response to katk23

Well I'm trying what you suggested except for:

"OpenDNS is the DNS service HMA Pro VPN is using automatically. If you're not a HMA VPN user and want to use OpenDNS, you have to sign up for it."

I wasn't sure where to make those changes.

So I'll let you know how I make out.

Thanks

gsspike

Level 1

10 points

Jul 26, 2012 2:56 PM in response to Shootist007

A lot of us had this issue since upgrading to Lion but Mountain Lion is much worse.

Rubenn.

Level 1

10 points

Jul 27, 2012 2:44 AM in response to katk23

For all the Dutch users that have a KPN Experiabox router:

1) go to http://192.168.2.254
2) Username: KPN Password: leave empty (You might have changed this yourself)
3) Go to Network (at the top)
4) Go to WLAN (at the left)
5) Set as follows:
Enable WLAN: Enable
Mode: IEEE 802.11g Only
Channel: 7
Transmitting power: 100%
Enable WMM QoS: Disable

This fixed my wifi problems. Good luck

Jul 27, 2012 2:46 AM in response to Rubenn.

Jep, that did it :-)!!!

Shootist007

Level 6

16,703 points

Jul 27, 2012 2:55 AM in response to Rubenn.

Yeah but now you are only connecting at G band speed not N band speed. There is something wrong with your Mac's. Why not have Apple fix them so they work as they are supposed to work.

Jul 27, 2012 2:59 AM in response to Shootist007

what is the difference between G band and N band?

gsspike

Level 1

10 points

Jul 27, 2012 5:28 PM in response to katk23

Well it worked last night and most of today, but it's BACK. Today I worked on why ML stopped checking my mail. Passwords all screwed up and I had to delete all my mail accounts off my mac and start over. Hmm maybe if I never turn on and check my email I'll stay connected.

gsspike

Level 1

10 points

Jul 27, 2012 5:32 PM in response to katk23

Apple tech Support left a message to call them before 6pm but I missed that cut off so hopefully I can reach them tomorrow or Monday.

No wifi connection after installing Mountain Lion HELP!!