Built-in MacOS IKEv2 VPN client st… | Apple Developer Forums
Uninstall CiscoVPN client, restart your computer, and then install Cisco VPN client again. See if this work around works. If it doesn’t, try this other method. According to a website, the proprietary CiscoVPN Mac OS X client is kind of buggy although it is verified that the native CiscoVPN works on Mac OS X … Cisco Error 51: Unable to communicate with the VPN Configure the client by going to the System Preferences > Network > Click on the “+” sign below the list of interfaces, select VPN from the interface list and Cisco IPSec from the VPN type, click create and enter your settings and your good to go. A fix for 'Error 51' with the Cisco VPN Client - Mac OS X
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Cisco VPN Client cannot connect - Error 51 Solutions Normally you would be right on track - more times than not, "VPN Subsystem" problems have to do with the vpn client software not properly communicating with the operating system. Don't know if you're dealing with a "windows thing" or an environmental issue - firewall, etc.
I have installed Mac OS X and the Cisco VPN client pops up an error when I launch it. I would like to see your suggestions about this error before I decide on what to do. Please keep in mind that am new to the Mac world. Error 51: Unable to communicate with VPN subsystem.
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