Occasionally my Mac will refuse to connect to work’s IPSec VPN with the error message:
“A configuration error occured. Verify your settings and try reconnecting”
This usually happens to me after a long time between reboots, and a reboot usually allows me to successfully connect again. Rebooting when I’m in the middle of something can be a pain, so I did some research and found a better way. There’s a process called “racoon” – it performs key exchange operations to set up IPSec tunnels. Kill it (using kill or activity monitor) and your VPN will start working again.
Works on OSX 10.6.5 and 10.6.6