VPN Problems . . . please help!

[dbally]

I've been trying to wirelessly connect to the campus network through my ibook with an airport card. As per their instructions I've been using Cisco's VPN software. Panther's doesn't allow for port configuring (that I know of). I can use the vpn software to successfully connect to the network, the ibook sees the network and gives strong readings about signal strength, and it looks to me like everything is working as it is supposed to. The problem is is that when I open Safari, iChat, or otherwise try to use the connection I get errors saying no servers can be found and no connection can be established. I've tried it with the firewall off and on. Any ideas?!