I have just installed mountain lion.
All went good, but now i have à problem with wifi.
My connection is ok, i get an ip adress, but i cant get On internet.
Safari says it has no internet connection.
When i connect on ethernet i have internet.
Do anyone know what The problem is?
MacBook Pro, OS X Mountain Lion
I have the same exact issue. 😟
Please help. I tried everything. I found these but to no avail. still cant connect.
Fix #1: Add a New Network Location & Renew DHCP
This may work best for those who upgraded from a previous version of OS X to Mountain Lion but if you’re having the wifi drop issue go ahead and do it anyway because it is consistently successful with addressing wireless issues:
Your wireless connection may now be active and working fine, but renew the DHCP lease anyway:
The network location and DHCP renewal tip resolved similar wifi problems in Lion, and it seems to work in Mountain Lion too for many users.
Fix #2: Change MTU Size to Prevent Dropped Connections
This is a bit geeky but bare with us: MTU stands for Maximum Transmission Unit and controls the largest packet size allowed for transmission over the network. If this setting is greater than network capacity, the computer will experience packet loss and dropped connections. The default setting of 1500 is somewhat aggressive and some networks reject packets of that size, but it turns out that 1453 is just small enough to maintain a consistent connection with most networks but just large enough to not cause any slowdowns, it’s the magic number and an old cisco networking secret.
Be sure you’re joined on a wireless network, close out of System Preferences, and enjoy the internet as usual.
I have a Mid 2011 iMac and I did have the wifi issues on Lion.
On Mountain Lion (fresh installation) I didn't have the wifi problems until I upgraded to 10.8.3 (combo update)!
So since 10.8.3 my iMac is affected with the wifi issues. I don't have the time for a fresh installation and to me it seems useless since I'm not a heavy user. After many hours of reading (lost hours Apple) I think it must be a OS issue!
Please Apple fix this, it is very annoying!
Okay, a little update....
I phoned Apple Support and was walked through a quite involved procedure which seems to have cured the problem.
It involved deleting preferences and cache, deleting the existing WiFi connection, repairing disk permissions, and setting up a new connection.Unfortunately I didn't keep notes, as I would have liked to have given fuller details here.
I found a solution which temporarily fixes the problem. It's only temporarily since the problem keeps coming back.
Here's what I have done :
In Finder, press command + shift + g and in the drop-down dialogue box, enter ~/Library
Locate the following preferences files :
- com.apple.internetconfig.plist
- com.apple.internetconfigpriv.list
In Finder, press command + shift + g and in the drop-down dialogue box enter :
/Library/Preferences/SystemConfiguration/com.apple.airport.preferences.plist
Copy the files somewhere as a precaution and then delete them from the Library folder and empty the trash.
Turn Airport off and reboot. Turn Airport back on.
It is only a temporarily fix, so Apple sort this out please! It's very annoying since the problem exists since Lion!
Another thing I applied :
Open finder press cmd + shift + g
Enter : /library/preferences/systemconfiguration
Now take the systemconfiguration folder and delete it
Provide your password then delete and empty the trash
Restart your computer
Another temporarily solution :
Use Onyx to clean the DNS cache.
None of the above solution actually keeps the problem away but it is a temporarily solution.
I've read that Apple is working on 10.8.4 and they are concentrating on WiFi issues. Hopefully it is a definitive fix, since the problem exists since Lion! Apple please!
Apple should fix this now! Otherwise I'll return my MBPr... I've tried every mentioned solution across the internet and nothing worked yet. I couldn't even restore my MBP over the internet after I've messed a BootCamp installation a few days ago.
Not cool, Apple 😟
Very disappointed at Apple. Not a proud owner of a MBA 2012 13.3. This is my first Mac and will be my last as I'm feed up with wifi issues. No help from Apple support as they act like they never heard of the issue.
Okay, I spoke too soon.
While my WiFi problems were indeed solved to my satisfaction, I made the fatal error of installing the Mountain Lion 10.8.4 update, and the WiFi is now just as bad as it used to be, suggesting that the update contains no WiFi fix whatsoever (much as I expected).
The same goes for other iMacs in our office - everyone who updated is experiencing the same troubles.
Why yes, we do have system images produced just after the working WiFi fix, so we will indeed be restoring to 10.8.3. I just posted to let people know that 10.8.4 is no kind of fix for our WiFi problems.
Art Machine wrote:
Why yes, we do have system images produced just after the working WiFi fix, so we will indeed be restoring to 10.8.3. I just posted to let people know that 10.8.4 is no kind of fix for our WiFi problems.
Good that you have images, restore them
Fortunately many posters to this site have reported that the upgrade has fixed the WiFi connection issues that plagued them with 10.8.3.
Art Machine wrote:
Fortunately many posters to this site have reported that the upgrade has fixed the WiFi connection issues that plagued them with 10.8.3.
Could you link to the thread(s), please.
CloneRec. wrote:
For me, the WiFi-issue has been fixed in 1.8.4! 🙂
I had terrible wifi problems on the enterprise network at my workplace, but it seemed to be fine after a while. Just recently updated to 1.8.4 after seeing the "wifi fix" in the notes, and I'm having wifi issues again. The wifi drops about every 20-30 seconds for 2-3 seconds at a time. It's incredibly frustrating 😟
It looks like 10.8.4 finally resolved the WiFi-issue. No more problems here. This thing cost many of us a lot of time, dissappointment and anger. I, for instance, had my WiFi-card replaced at the Applestore in Amsterdam, to no avail. Not a single word of explanation from Apple, though. Frustrating.
I'm glad your issue was resolved. I don't have any problems on my home network, everything works great there. The problem is when I'm on the enterprise network at my workplace. I have a windows laptop I also use, so I know the quality of the wifi signal is just fine. There's something out of whack in OS X that's making this experience ****...I hope Apple resolves this issue soon...
I have to admit that since 10.8.4, the situation greatly improved. Once in a while, the connection is capricious but globally I can't say I still have the problem. Didn't do anything special except specifically assigning channel #11 in my Airport Extreme router.
Mountain lion wifi problems
