Our company issues AT&T Air Cards to our field guys. They've always been able to use those cards to connect to the internet, then launch the Cisco VPN client to connect back to the office. Then they could browse our network, get files, launch apps, etc .. etc. This has stopped working. They can connect to the VPN and authenticate, but cannot go any further. Now the wierd thing is, if they don't use the Air Card, and they can get access to a wired connection to the internet, or even a regular wireless on a home network, everything works perfect. The problem seems to be with someting that the Air Cards use, like a certain protocol or port or something. But nothing has changed on our network to my knowledge. Any ideas?