Mountain lion wifi problems

Yeah, I'm thinking you're right, but it's such a shame that Apple is making an OS that has this problem when no one else is. I'm guessing it could be set to "G" instead of "N" and that would solve the problem for me, but that's nuts for everyone else.

Why guess when you can look and see?

Hold the option key and click the wifi icon in the menu bar, your connection details will be displayed.

Try making a new connection on your Mac.

Open System Preferences>Network, click the + sign at lower left, select WiFi, give it a name (office?) and configure it for your office network.

wclyffe wrote:

Yes, thanks...a great tip! The router is 802.11N and it's WPA2 Personal for security. I could ask them to make a change, but why should they. This is ridiculous! Thanks again!

And this issue (I have seen it twice) only appears when the bulk of the network clients are PC's and WPA2 is the security chosen, changing to WPA is simple and does not affect any other clients.

Plugging it in with a wire is even simpler and as I said, a far superior connection.

Or try making a new connection, I posted instructions above.

All I can tell you is that if you do nothing, it will stay the same.

johnboyuk wrote:

What I did....

reset PRAM

boot up into the utilities thing (command R?) and repaired disk, and repaired disk permisions

Deleted all wifi locations from the network preferences panel

Deleted all wifi passwords from the Keychain App

Trashed the SystemConfiguration folder from Library>Preferences

Then re-installed Mountain Lion (not a completely clean install... just the normal one)

So far so good... hope it helps somebody

What is the consequence of deleting the SystemConfiguration folder in Library>Preferences? Does OSX rebuild it back to a default level, or does it require a reinstall at that point? I have already deleted the Wifi locations, deleted passwords, etc., but nothing has worked so far. I'm ready to kill the SystemConfiguration folder but I'm nervous that I'll have a bit of a lobotimized machine after that.

So, can anybody speak to that?

I just got a new MacBook Pro a month or so ago and it came with Mountain Lion. The WiFi and Ethernet connections work fine where I work and on a separate network we maintain here. However, when I take my laptop home, the WiFi and Ethernet don't work. It shows a connection and an IP address, but I can't resolve any host names. I can ping IP addresses like 8.8.8.8, but pinging www.google.com gives no results. If I disconnect and reconnect, I can sometimes get it to resolve one host before the network stops working. And that's just it, it KILLS my network. If I disconnect my laptop from my network, everything works fine, but as soon as I connect my laptop, no device on my network is able to resolve anything.

I have tried every solution in this thread and nothing has worked. Using a tool on a separate computer on my network shows that my laptop is spamming it with weird traffic - like DNS flushes and whatnot. So my theory is that my computer is spamming everything to the point that nothing works... like a denial of service attack.

Does anybody have any feedback on this? I don't know why it works at my work, but not at home. The other network I've tried uses the same model of router and it's fine. I tried updating firmware and that did nothing. It behaves the same way whether it's a WPA or WPA2 key. My cable modem has a wireless router built in which I've tried and it does the same thing as the standalone router.

This is really frustrating. I could just go back to Lion or Snow Leopard, but that seems like a ridiculous solution. I can't believe Apple hasn't released a fix for this with as many people that are having trouble.

Alright guys. I bought a new iMac mid 2011 on Dec 2, 2012. It came in about a week later. I noticed the WiFi issue. For me it would connect, then after a while, somtimes ten somtimes an hour, it would disconnect. The thing in the corner would show had it is connected, with full bars, but on Safari it wouldnt load pages, iTunes would load, Mac App Store wouldnt load, and all that crap. I scoured for a confirmed fix, but no one had anything concrete. I ruled out my router being bad b/c my iPad, Xbox, old MacBook with Lion, and my awesome Blackberry, never had a problem with it. My Xbox does from time to time, it just dissconnects but the network card on that thing is kinda old. So i decided to call up Apple support and chit chat with them. We trouble shooted it, I told the chap that i read through all these forums and blah blah. He had me reset the PRAM and whatever the other one is. At the end he said give that a go, if it still occurs make a Genius Bar appointment and have them take a look. Well about 15 minutes after i got off teh phone with them it did the thing where it disconnected. I, reluctantly, made a Genius Bar appointment; I just didnt feel like walking around the mall with a freaking iMac in my hands. I felt pretentious and stupid and people stared. It was also heavy and my arm was tired. I had the fellow at the Genius Bar take a look at it. He said they would hold onto it, do some crap and change the out the Airport card. I believe what they did was go on the website called thehumanclock.com and run that overnight. Pretty interesting site btw. I dont know whos idea it was, or why they thought it was a good one, but good on them. I just got my computer back today, everything is going good so far. So if your computer is still on warrenty or Applecare, I would sugguest you try that. So far I have not had an issue with it, and everything seems to be running swimingly. If not, it will cost about $108 for a new card + service.

TL;DR Make a Genius Bar appointment and ask them to put a new airport card in. I think it did the trick for my machine.

Having the same problems a couple of times a day. Like everybody else, noticed that none of the ´solutions´ really work. It´s not only Mountain Lion, it also has to do with the current hardware. I´m running ML on two different iMacs, one recent and an older one. The older one doesn´t disconnect while the newer one does.

So... Apple... watchagonnadoaboutit?

If you can ping an IP address but not a domain name, then it sounds like you have a DNS problem. Since you probably connect to a different DNS server when you're on a different network, that explains why your network connection works other places.

(Also, identical routers can have different settings. Just because the hardware is the same doesn't mean that the networking is the same.)

I would try the two fixes described here:

http://osxdaily.com/2012/08/02/fix-os-x-mountain-lion-wireless-connection-proble ms/

Good luck!

I changed to wired and had the same problems I had with wireless. I changed everything to manual, manual IP and router. Had trouble with the DNS server not being recognised. I changed it to only 1 DNS and it appears to work, the dual DNS servers seams to confuse mountain lion, still takes a couple of minutes to find the DNS server but does it eventually and then works.. Changed MTU to manual as well. problem seams to be related to samba and DNS servers, samba doesn't like long network names 12 and over kills the connection.

New MacBook Air purchased Oct 2012, had the intermittent wi-fi issue to a Motorola SBGsurfboard 6580. Tried all the "fixes" posted on various tech sites, and none worked. The fix that seems to finally have solved the problem is restricting to wi-fi to "g" mode only (i.e., do not allow "n" connection). so far so stable...

For anyone this might help....

My post from 12/10 is below, and today I pushed the IT department to double check my actual access point. Well, they did and found there was a firmware update available that they were unaware of. They did the update and as far as I can tell the problem is fixed. This was the first time I used my computer for 3 hours straight and didn't get disconnected from the Internet. I'll have to use it more, but so far I'm optimistic!

wclyffe

Re: Mountain lion wifi problems

Dec 10, 2012 5:19 PM (in response to henrijacobs)

As I mentioned in an earlier post, I have a brand new MacBookPro with the same terrible wifi performance dropping out on a Cisco WAP 4410N at work, but no problem whatsoever on my AirPort Extreme at home. I have tried literally everything on this thread except for a clean install, but there are already many individuals who have done that and it still did not solve the problem. I've even tried johnboyuk's plan of doing several steps all at once, but I still have the problem. The router is configured with WPA2 and no one else is having a problem. Anyone happen to be dealing with this unit by Cisco?

My solution to the problem was a dirty and painful one. i went and spent money on an airport express, installed it and have had almost no wifi problems on my late 2011 mbp running latest ML since then. once a week maybe, but certainly nothing like before. Setting up a ping command to run eternally probably would have done the same thing. but it also seems to improve my connection between apple tv2 and other mac shared libraries. my router is an airties RT-204v3, the provider only supports v1. something of bios so no update possible(this is in Istanbul).

let me clarify the "painful" comment above. It wasn't about configuring the airport extreme. It was about the fact that there is absolutely no good reason I should have had to go and spend another red cent with a company I am extremely frustrated with because of problems like this ridiculous wifi issue, which seem to be more and more common.

Here is what worked for me. Called Apple Support. My iMac was not connecting to my wireless network, or would sporadically. The kind agent told me that if I were to change the security settings in my router to WPA2 that more than likely would solve my problem. Prior to this I was simply using WEP encryption. I thought he was nuts, but did as he suggested. Well. Its working absolutely flawlessly now. For those still using WEP, change your security settings and see if this works. I am happy again and not ready to use my Mac for scrap.

Hi Folks,

I'm using a MBP13 Late 2011 OSX 10.8.2.

I upgraded some months ago but the problem only appeared recently. The connection is extremely slow and sometimes drop the connection, even if the wifi icon on the bar is "full".

On the same room of the router, connection is fine, but distant is too slow. I have noticed also that when a wireless phone working on 2.4 band rings and some answers it, the wifi drops, and it will be restored when the person hangs up.

I have run tests changing MTU 1400, Channel 11, New DNS, none of this worked.

But the Bluetooth ON with the Magic Mouse after 20 minutes begin to cause interference.

What i notice with iStumbler and with the Diagnostic Wifi Tool buil in on ML is that:

Router is set on a specifc channel, for example, channel 11.

When Bluetooth is OFF, the speed of my connection is normal and MBP reconizes as the channel 11.

When Bluetooh in ON with Magic Mouse, the computer does not recognize which channel is, and shows that is connected on Channel 1. I think this is because of the interferences Bluetooh causes.

I will not buy another router, this is wrong, everything worked fine some months ago. But i'm think of buying a wired mouse, but the speed of my work will decrease significantly.

Hope this helps.

Bruno Redondo