Software: Cisco VPN client 4.6.03 (160) and probably other versions, on OS X 10.4.2 through 10.4.4 (at least, and so far)
Hardware: PowerBook G4/15"/1.5GHz (probably not hardware-specific)
Problem: Sometimes after reboot, sleep, or network connection change, my Cisco VPN client will refuse to launch with this error message:
Error 51: IPC socket allocation failed with error ff ff ff ff ff ff ff fch. This is most likely due to the Cisco Systems, Inc. VPN Service not being started. Please start this service and try again.
Solution: The easiest solution is to wait for your network interface to be ready before launching the VPN client. However, Quicksilver makes it too easy to launch before the NIC is ready. Sometimes that isn't the problem, though. When I need a stick instead of patience, I run these commands on the command line, and then the GUI client will work.
cd /opt/cisco-vpnclient/bin
./vpnclient autoinit
If that doesn't work, try reloading the VPN kernel extension.
sudo kextunload /System/Library/Extensions/CiscoVPN.kext
sudo kextload /System/Library/Extensions/CiscoVPN.kext
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