Cisco VPN Client Error 51 – Open Your Firewall

Asked By gloriawburbage 20 points N/A Posted on - 08/09/2012

Hi all

This is very easy, very usual error; however it is so tough to find a fast solution.

Symptoms: When you are trying to start a Cisco VPN Client right away you are finding this error:

Error 51: Unable to communicate with the VPN subsystem.

Please make sure that you have at least one network interface that is currently active and has an IP address and start this application again. 

What should i do now?

Please help me. Thanks a lot.

Error: Error 51: Unable to communicate with the VPN subsystem.

Please make s&re that you have at least one network interface that is currently active and has an IP address and start this application again.

OK

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Answered By Carl Jack 10 points N/A #139852

Cisco VPN Client Error 51 – Open Your Firewall

Hello Gloria,

The best way to solve that problem will be using the following:

sudo SystemStarter restart CiscoVPN

If you get the problem more often you should try to make an alias out of it. Just add the following line of code to your .bash-profile and see if it will solve the problem:

alias resetcisco='sudo SystemStarter restart CiscoVPN'

If you do the above and you still do not find a solution to your problem you should try an upgrade or a security patch. Make sure you do that after a reboot. The problem might be as a result of something being amiss in the kernel extension. If you have a copy of the Cisco installer you can try reinstalling it and see if that will solve the problem.

Regards,

Carl

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• Posted on - 08/09/2012
• Question Category: Networking