Error 51: Unable to communicate with the VPN subsystem

Every now and again, I get the following message when starting the Cisco VPN Client on my iMac:

Error 51: Unable to communicate with the VPN subsystem

It turns out there is an easy way to fix the error. Simply open a Terminal window and type the following:

sudo /System/Library/StartupItems/CiscoVPN/CiscoVPN restart

It will ask you to enter your password then it will restart the VPN subsystem and you should then be able to run the VPN Client with no more errors (once or twice I’ve had to run this comand a second time before it would work).

75 comment(s) so far

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Menteri Agama RI wrote on January 23, 2008

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Good solution..

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This help me with this same problem:

forum.maas360.com/.../fix-for-cisco-v

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Your tip helped me to get rid of one of the most annoying troubles with VS.

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At last! I have been looking for a solution to this problem for ages.

MANY THANKS!

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I like your guide on how to fix vpn.

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What password should I punch in?

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