Cisco VPN error 51 on OSX

Oct 23, 2009 List of Error Codes for Dial-up Connections or VPN Connections Mar 29, 2017 Cisco Error 51: Unable to communicate with the VPN cisco-osx-error-51-vpn-subsystem This is a nice little frustrating error message that displays on launch of the Cisco VPN client application for OS X in either 10.7 or 10.6. There are a couple of solutions to be found online, the first one is restart the VPN service via the command line. So in the Terminal run the following command:

Azure VPN Gateway: Troubleshoot Point-to-Site connections

Error 51 with 11.0 client - Macintosh - Discussions Oct 23, 2009

Dec 18, 2006

Error 51: Unable to communicate with the VPN subsystem Apr 01, 2015 CISCO vpn error 51 - Ars Technica OpenForum