A friend is trying to connect his MBP 17 (2.6GHz) to our office wifi network, but it simply isn't working. Despite entering the correct username and password, he gets constant "8021.X authentication failure" messages, and/or the machine fails to grab an IP address via DHCP and generates a self-assigned IP address so he has no internet connectivity. Nobody else in the office running Mac laptops has any problem, and my friend can connect to the network using his iPhone with no issues at all. The only way his MBP will connect is via an Ethernet cable, and that's not a practical option going forward. Needless to say, he has no issues connecting his MBP to *other* wireless networks. So - any suggestions? We've been round and round on this and have reached the point where we think a reinstall of OS X might be necessary. Our IT department has no clue either, but then they don't really understand Macs anyway.