Click on Properties once you select the wireless network that is having problems.Click on the Authentication tab and now uncheck the Enable IEEE 802.1x authentication for this network box.
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I am using the Windows Wireless Connection Manager. On a couple of occasions I've seen that particular AP (don't know what firmware) suddenly stop attempting to authnenticate clients (it never sends any RADIUS requests) and power-cycling the AP "fixes" the issue.
I suspect a firmware upgrade probably fixes that behaviour. If you want to accept both computer credentials and user credentials you'll need to name both "Domain Comptuers" and "Domain Users" in your policy.
Select your encryption type from the "Network Authentication" and "Data Encryption" drop downs.
Uncheck "The key is provided for me automatically" and enter and confirm your Network key.
After about 30 minutes of fiddling around with various settings, I was able to figure out what the problem was.
Here’s how to connect to your wireless router if you are getting this message.You'll need to note the default IP address of the router (usually in the range 192.168.0.1 though it varies by model).Connect the computer to the router with an ethernet cable.First, click on the wireless icon in your taskbar and under Related Tasks, choose Change advanced settings.Now click on the Wireless Networks tab and select the network in the list at the bottom.In this window make sure you are in the "Association" tab.