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When I attempt to connect the Cisco VPN Client on a Mac OS, I receive this error message: Error 51- Unable to communication with the VPN subsystem. How can I resolve this issue?

April 26, 2017attempt Cisco client Connect Error Mac message OS VPN

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When I attempt to connect the Cisco VPN Client on a Mac OS, I receive this error message: Error 51- Unable to communication with the VPN subsystem. How can I resolve this issue?

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A. The issue can be resolved if you restart the service after you close the VPN client in this way: To stop: sudo kextunload -b com.cisco.nke.ipsec To start: sudo kextload /System/Library/Extensions/CiscoVPN/CiscoVPN Also verify the following running on the same machine where the VPN client is installed and disable the same. • Any virtual software (such as, VMWare Fusions, Parallels, crossovers). • Any antivirus/firewall software. • Compatibility of the VPN client with the 64-bit operating system; refer to the Cisco VPN Client Release Notes.