Windows XP not connecting to WPA-2

I've had to implement wpa-2 for our wireless due to people giving out the wep keys.If there are other solutions ,I would be more than happy to entertain them. First off, the windows 7 machines have no problem authenticating.It' s the XP machines that sometimes will not connect or will never connect. I've had 2 exact machines (laptops) with XP and 1 will connect and the other will not. A work around was to UN-join the laptop from the domain and then re-join it and it would connect (authenticate).This however, did not last and the machine would fail to authenticate eventually.Some machines would have to be Un-joined and RE-joined to the domain several times and they finally would authenticate.
jaxnmjAsked:
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Imran SaeedIT Technical DirectorCommented:
First make sure you are have XP SP3 installed and fully updated.

Check for Wireless NIC driver update.
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Jakob DigranesSenior ConsultantCommented:
WPA2 is "just" a a more secure way to handling keys, and authentication details.
No need to join/unjoin PCs from domain.

Or do you mean you've implementet 802.X ??
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rindiCommented:
No there is no other thing than WPA2, never ever use WEP as it provides no security at all. Also make sure your Wireless AP's aren't hidden, that also rather decreases security than increasing it.

Check for newer drivers for the Wireless NIC, and maybe use the Manufacturer's utility and not the windows built-in zero config tool if the issues stay. Also make sure XP is completely patched and up-to date. Disable power-saving features for the wlan device.
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jacobstewartCommented:
As rindi stated this is most likely related the the wireless nic in the machines.  Some older nics cannot authenticate with wpa2.  You need to check for updated drivers to the wireless nic.  If that does not work possibly try a usb wireless nic the authenticate.  If the usb nic works you know it is the internal nic that is not capable.
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Jakob DigranesSenior ConsultantCommented:
deleting wireless profiles do not work, but unjoin+rejoin computers to AD will work - for some time... ?
If you have a PSK secured network, domain membership have absolutely nothing to do with authentication, but with 802.1X however
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jaxnmjAuthor Commented:
I have 2 identical Laptops , both patched, up to date, drivers and all. one connects, the other does not. However, they both will connect to a wep or unsecured network. If I was to un-join/rejoin to the domain, the laptop that doesn't connect will finally connect. Strange, but it will not stay that way
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rindiCommented:
Have you really checked for newer drivers, and with fully patched, you mean SP3 with all windowsupdates (also those from yesterday)? Did you check the NIC manufacturer's site for info on problems with your devices, and are you using their tools or the builtin windows one?
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Jakob DigranesSenior ConsultantCommented:
please give detailed instructions on how they authenticate.
WPA2
AES?
TKIP?
Pre shared key?
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Darr247Commented:
The only XP laptops I've seen have problems connecting to WPA2 auth/encryption (with adapters and drivers that supported WPA2) were actually not updated fully... you could run windows update on them and it would finish, then run it again and the same updates would still be needed.
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Craig BeckCommented:
Make sure you're not using WPA2/TKIP.  Some legacy Wireless NICs don't like WPA2/TKIP - they prefer WPA2/AES, or WPA/TKIP.
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jaxnmjAuthor Commented:
Thank you for the great responses!
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