Tod Wildason reports getting an Error 51 with the Cisco VPN Client since upgrading to Mac OS X 10.5.7. We've had several reports of this problem, Wildason's is the first to mention the error message: Ever since upgrading to Leopard 10.5.7, I can_t use the Cisco VPN Client 4.9.01 (0100) to connect to work. I keep getting the Error 51 message, which indicated that no network subsystem is up and had