We recently upgraded our WLC 4400s to 220.127.116.11. This was requested by Cisco. When the students returned from Christmas break, any student running Vista is able to authenticate to the AP, get an appropriate IP address and DNS configuration, but cannot get to any network resources, including Internet. If we hard code the DNS information in the wireless card TCP/IP Properties, the user can get to some Internet sites, but no HTTPS pages.
All XP and MAC machines appear to be working fine.