Lion WiFi Connection Problem

This seems to be working for me:

Open System Preferences -> Network

Click the little gear drop down and choose Set Service Order

Make Wi-Fi be the top

Click Bluetooth PAN and then choose Make Service Inactive in the gear drop down button

Of course if you need to use Bluetooth you can try leaving that on. Maybe it's just having Wi-Fi be the top of the service order.

After upgrading my early 2008 MBP to Lion, I also couldn't even get WiFi to turn on. Tried from the status bar icon, network preferences...nothing.

I shut down and restarted the machine a couple of times and it started working.

No explanation, no error, just wouldn't turn on.

You might try a couple of shutdown/restarts if you haven't already.

Hi every one,

Abast is the problem!!! I uninstall Abast and everything ok. Is not sufficient disable Abast is necessary uninstall.

Thank you for your help!!! and sorry for my English, I'm from Catalonia (Barcelona)

Carles

Hi and thanks to whoever say it was avast!! i had been having the same problem with the wifi since I installed the Lion 2 days ago and talked to Apple and they didnt know what was it. I just UNISTALL the Avast as he said u need to unistall it and automatically my wifi is back and running!!

good luck to the rest

Ligia

Sorry to say no avast on my machine and still no wi-fi. I spent a lot of time on the Abobe site and there are lots of people talking about the Java Runtime I wonder does Avast use that as well as Adobe?

I had an issue where I can connect to wifi, but I cannot browse the internet or do anything internet related. I tried to create a new profile and it did nothing, I then did a erase and reinstall and restored from time machine. Still did not work. I then uninstalled Avast, which to do that you have to launch Avast and go to the bolded icon on the top left corner and click on uninstall Avast and everything has been working perfectly since.

I've had the same problem since last night. My issue was resolved following these instructions:

In Network Preferences, turn off Wi-Fi, delete the Wi-Fi service, deleting the Automatic location. Using the + button create Wi-Fi again, and then rejoin the network. Also, under the settings gear icon, choose Set Service Order and move Wi-Fi upwards.

So far, the connection is stable, but this might be a temp fix to the issue.

Cheers

didn't work for me either using a 2009 macbook pro. my problem is just when waking for sleep it won't connect for 30 secs to a min, which is really annoying because that's just enough time for my time capsule to think i have to wifi and stop backing up so then it has to start all over after i re-connect. it's getting old. Apple, i always upgrade to new OSs the first week they launch since the first OSX and I've had internet connect issues with more than half of them. fix it.

I have a 2007 iMac and I am having the same problem. I have tried every posible tip that people have posted and nothing works. Computer goes to sleep and the wifi goes out. When I wake the computer, it says it is connected, but there is no acutal connectivity.

i tried it and thought it worked, but it did not. it seems to only not want to connect when i've had my macbook pro asleep for an extended period of time... something like more than 5 minutes. it's weird.

The SMC trick worked for me, but I didn't even have to get that far.

After installing Lion, all of my WiFi devices (iPods, iPhones) would no longer be allowed into my access controlled WiFi network - my desktops are wired to the Airport/Time Capsule via ethernet cable.

I had restarted several times. However, reading the guidance for the SMC reset, it said to restart, the try a _shutdown_ before going to the SMC reset. It was the shutdown that did the trick, which I had not done up to that point.

Thanks, galmeida-us.

JZ

I did the SMC reset, still no result. Any other ideas out there? Same problem - works fine on start-up, but on restart after sleep it doesn't allow network.

Strangely, according to the network utility, it appears to have correctly picked up an IP address from our router at home but still no traffic (either email or internet/browser).

Thanks in advance...

UPDATE on no wifi after sleep issue.

I noticed the following:

1. The MBP does successfully pick up an IP address immediately and appears to be connected.

2. It IS possible to PING other devices on the network. So connectivity is there.

however

3. Even though ping works OK, browsing the internet does not.

Any more ideas anyone?

Same problem here. WIfi is fine, computer gets put to sleep, and upon waking, connection errors. But the computer says it's connected to the router. My fix is to run diagnostics on the connection, which fixes it quickly. But it's quite annoying. Everything was fine until the Lion upgrade, so I have to say that it was Lion that caused the problem.

It's a pretty anoying bug on my iMac Mid 2009 i5!

Sometimes I have to de- and reactivate aiport every 5 minutes...

I tried to delete every .plists i found in the main and the users library according to Wi-Fi or Airport... I made SMC and PRAM-Reset. I repaired the permissions... I deactivated Java (I needed to install, because of PS CS5.1)....

Nothing helped.

I hope, there will be an update very soon!

Maybe someone knows about another workaround;-)