I have been using the built in VPN client in network preferences to connect to various Cisco IPSec VPNs since I purchased my computer. For about the last week any time I try and connect to a Cisco IPSec VPN I get an error message saying "The VPN server did not respond. Verify the server address and try reconnecting." Other Mac users in my company are able to connect using this method and I've double checked to verify we are using the same settings. I am however able to connect to PPTP based VPNs. Does anyone have any idea how to resolve this issue?