I have a laptop which had have XP Pro reinstalled. After the intitial install (ser pac 3) the laptop was able to authenticate to the network. Once all Windows updates were installed, the laptop could not authenticate. When I reboot the phone, the laptop connects. Once the phone software comes up, the laptop is disconnected...no link activity or connection light on the interface.
I know it isn't a hardware issue because I can boot to Linux and the network interface works perfectly.
Does anyone know a specific Windows security update that would do this?