After upgrading to iOS 5, no Wi-Fi connection possible on iDevices.

Yesterday I upgraded my iPhone 4 to iOS5 and after that I couldn't connect to my Wi-Fi anymore. In the Wi-Fi settings the connecting symbol just keeps on rotating but I do see the Wi-Fi symbol in the top corner. But using per example Safari just ends in the fact that I don't have a connection with the internet. So I thought I will try again tomorrow but today the same. This morning I upgraded my iPad to iOS5 and suprisingly exact the same problem occurs.
Some things I already looked into:
My Mac is on the same Wi-Fi and does work.
My Wi-Fi worked on my iDevices before upgrading.
My Airport says it has 3 clients with excellent connections. (My iPhone, iPad and Mac).
Can't connect to other networks as well.
Tried a reset.
Tried a hard reset.
Tried switching airport modus off and back on.
Tried switching Wi-Fi off and back on.
Tried refreshing the lease.
Tried "forget network" and connecting again.
Tried "Restore networksettings" in the general settings.
So now my despair leads to here. I'm out of possible solutions.

I had this same exact problem with my iPhone 4 - I can connect to my wireless router (Airport Extreme) but unable to access the Internet. I went through the same troubleshooting steps with no luck. Like you my iMac was able to get to the Internet via the same router. When I looked at the connection details for the Airport Extreme connection it showed the DNS address as the same as the router's IP address (10.0.1.1) which I didn't think was right. I tried to change it manually, but I don't think it really took. So, I had a hunch the problem was with the connection to the Airport.
With that in mind, I swapped out my Airport Extreme for an old Linksys 802.11g wireless router I had and after connecting my iPhone to this alternate wifi I am now able to get on the Internet and use Safari just fine! One thing I noticed is that now with the Linksys router the DNS address is the IP address of the real/correct DNS server provided by Cable Internet service. Both routers were using the same WPA2 wifi security scheme.
So, at this point I have working wifi but I'm not sure what the real problem was and how to go back to my Airport Extreme. Could it be a bug in the iOS 5 Wifi interace that's preventing it from getting the correct DNS address? Or 802.11n vs g? I would check your DNS address on the iPhone and compare it to your other devices. Hope this helps.

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