Error 51: Unable to communicate with the VPN subsystem.

Asked By 20 points N/A Posted on -
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Hi Everyone,

My teacher that just got a new Mac. Mac OS X, V 10.6.7, Intel Core i5, I have tried to install Darwin 10.7.4 64 bits, it got installed properly. But while executing the program its throwing error.

Error 51: Unable to communicate with the VPN subsystem.

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.

I have even tried with following versions, but the result is same.

vpnclient-darwin-4.9.01.0180-universal-k9.dmg

vpnclient-darwin-4.9.01.0280-universal-k9.dmg

Hope someone can help,

Thanks

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Best Answer by Drake Vivian
Answered By 0 points N/A #132993

Error 51: Unable to communicate with the VPN subsystem.

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Hi Roger,

Error 51 caused by an issue with the interprocess/driver communication. As you mentioned about V 10.6.7 but I’d suggest you to use the built-in Mac OS X IPSec client. If it is unavailable, try to re-configure your Mac to boot into the 32bit kernel.

I hope this will solve your problem.

Good Day.

Best Answer
Best Answer
Answered By 0 points N/A #132994

Error 51: Unable to communicate with the VPN subsystem.

qa-featured

 

Hi there Roger Neil,
 
This is a common problem caused by bad handling of network adapters reappearing. You can always try using the native VPN client instead of the CiscoVPN software, but if you insist on using the CiscoVPN, there are few things you can do to fix the error without restarting your computer.
 
Go to Applications – Utilities – Terminal and open the Terminal window. 
 
If you are using the older version of the OS type:
sudo /System/Library/StartupItems/CiscoVPN/CiscoVPN restart
 
For the newer type:
sudo kextload /System/Library/Extensions/CiscoVPN.kext
 
Or just:
sudo SystemStarter restart CiscoVPN
 
Press enter.
 
You need to be an administrative user and will have to provide your admin password to complete the process.
 
This will restart the CiscoVPN and make everything work again.
 

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