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Error 51: Unable to communicate with the VPN subsystem.

November 14th, 2010 Leave a comment Go to comments

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.

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  1. Paul
    May 6th, 2011 at 11:59 | #1

    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)

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