Unfortunately, the server is not a Mac OSX Server with Workgroup Manager. As far as I know it seems to be to be windows 2003 or so. Also, I'm not the system administrator. Worse, the system admin does not know anything about MacOSX since he is MS certified only. We tried to figure it out for hours.
In this school environment, there are about 250 wireless windows XP clients. Some teachers have Macs running Snow Leopard. These Macs do not authenticate to the WPA2 Enterprise wireless network over 802.1x using PEAP. An authentication certificate from the server is installed. Also I tried user, login window and system profiles as described in
http://support.apple.com/kb/HT3326? but nothing worked.
AllI get is: after choosing the SSID and supplying username and password, an error message appears ( type -1) and the computer gets a self-assigned IP adress.
I really do not wish to downgrade to Leopard pre-10.5.8 or even Tiger!