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lose wifi connectivity, GP's fail and then logon failure
Hello,
I have a network with several hundred laptops, I have mostly XP machines that are all working fine. Recently I have rolled out 2 new models of laptop (80 or so) running Win 7 Pro, everything works fine after imaging I run a gpupdate, policies come down without errors and everthing is fine.
After what seems like random periods of time, the Win 7 laptops (always a few, but never all of them) stop logging on users and I get the error: "There are currently no servers availiable to service the logon request"
So I go into the logs on the laptops, I see connectivity failures, at this stage it's worth pointing out that one type of laptop has an Intel Wifi adapter and the other an Atheros, one is a HP and the other a Lenovo and none of the laptops have virtually any hardware in common. Our wireless is a managed CISCO solution and does not experience any issues at the time. There are often XP machines (same type of laptops) along side the Win7 ones and they are working away fine.
When the connectivity issue occurs on the win7 client it does not recover and we then have to do a gpupdate over a LAN cable, the policies are again applied (no errors) and after a reboot the wireless is back and working and users can logon fine.
I have tried many things that I have read on the web without success, I'll give you a short list of what I've have tried:
-I have updated drivers
-I have the latest Win7 updates
-IPv6 is now turned off
-WINS is now off too (don't need it anyway)
-GpNetworkStartTimeoutPolicyValue added @ a delay of 60 seconds.
-Local printer installed instead of network GP install incase of dodgy win7 printer driver.
-Disable Microsoft virtual Wifi (in device manager)
-Power saving turned off
-disabled and re-enabled the adapter
-changed network types from WPA2 to a WPA-PSK and manually specified key on client, connectivity still fails and client forgets key.
I have also tried the usual restarts etc... and am fast running out of idea's, so I'm really hopeful someone might have some suggestions?
Any help would be very appriciated..
thanks.