Error 51: Unable to communicate with the VPN subsystem.
If you’re on a Mac OS using Cisco VPN, more than likely you have seen this error. In order to fix that error, simply type this command:
sudo /System/Library/StartupItems/CiscoVPN/CiscoVPN restart
And you’re set! Restart the VPN client and you should be set to use it again.
I’ve tried this but I get this
(kernel) Kext com.cisco.nke.ipsec not found for unload request.
Failed to unload com.cisco.nke.ipsec – (libkern/kext) not found.
Starting Cisco Systems VPN Driver
/System/Library/Extensions/CiscoVPN.kext failed to load – (libkern/kext) requested architecture/executable not found; check the system/kernel logs for errors or try kextutil(8)