My wife fixed the Lion Internet connectivity Problem!!
This story kills me. I upgraded to lion on our two MBP. Mine worked great. My wife had the problem where, upon waking, the MBP was still connected to the wifi (airport express) BUT she had no connectivity to the internet.
I researched the heck out of this and tried everything.
I got on Apple care and we tried another 30min worth of stuff. Eventually they said bring it to a genius bar. I almost thought I had it when I reset everything to factory default on the airport. It worked a few times but then went back to the same problem.
Last night my wife popped out a cd in here machine. She asked if I had put it there. I had about a week ago. Not long after that he MBP problem went away. Well there is no way a CD in the laptop is going to affect internet connectivity.....so I assumed that my airport reset finally did the trick.
But.... this AM I noticed in the Apple support area that someone else noticed that when they pulled a cd out.....things worked.
This is ridiculous....
So I put the cd back in here computer....the problem is back!!... pulled it out....problem gone!
Went to my computer which never had a problem....put CD in....now I have a problem.....pulled it out....no problem (note that you do have to cycle the wireless one time only after you have the problem.... after that sleep...wake....restart....you name it it worked. The CD is a blank CD by the way.
So its crazy but my wife, who had problems with my tv remote, fixed the problem!!
15" Macbook Pro, Mac OS X (10.6.6)