can't connect to wireless since upgrading to Lion

[staypuffinpc]

I upgraded a late 2006 MB with 4 GB of 667 MHz DDR2 SDRAM and a 2 GHz Intel Core 2 Duo processor to Lion. Now, it can't connect to wireless. I see my local network, but I get the message, "Unable to join Wi-Fi network." The system has given me a self-assigned IP. I've tried to renew my DHCP lease manually, entering the WAN IP of the router as well as the subnet (I have another computer that I haven't yet upgraded that I was able to use to get this info). Still, no luck.

Any ideas on how to resolve this?

EDIT: Looking at my the MAC addresses in the wireless statistics of my router reveals that my MB is connected with about a 70% signal strength. However, it's the only of 5 current connections that does not show up in the DHCP client list. I changed the name of the computer when I reinstalled. I wonder if that's also causing an issue.

 

[staypuffinpc]

got it!

OK, I tried a lot of things, including zapping the PRAM, turning things on and off, etc., but none worked. Finally, I renamed the plist file found at /Library/Preferences/SystemConfiguation/preferences.plist to "preferences.plist.old." It took a minute, but then the connection finally went through.

 

[staypuffinpc]

Not really fixed

Ok, so after using this for about a week, it's getting REALLY annoying. I have been able to connect to the wireless, but only after entering the password EVERY TIME. If I try and tell the network to remember the password, I get an error and it tells me that I can't connect (even though I do). Today, I totally lost any connection ability and I had to trash the plist file again. I'm not sure what's going on, but going through online records, it seems that this problem crops up every time someone upgrades their system--since Tiger!

Has anyone else encountered this issue? How do you fix it permanently?

 

[blueroom]

Wait for a Lion patch or downgrade to SL.