Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Sometimes our Macs will get

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.

when starting Cisco VPN.

Rebooting doesn't help. Reinstalling requires reconfiguring the settings.

What's the best way to reset Cisco VPN when we get this error?

share|improve this question
up vote 2 down vote accepted

Alternative command:

sudo SystemStarter restart CiscoVPN

share|improve this answer

From a terminal window:

sudo /System/Library/StartupItems/CiscoVPN/CiscoVPN restart
share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.