有时我们的Mac会得到
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. 启动Cisco VPN时。
重新启动没有帮助。 重新安装需要重新configuration设置。
遇到此错误时，重置Cisco VPN的最佳方法是什么？
替代命令：
sudo SystemStarter restart CiscoVPN
从terminal窗口：
sudo /System/Library/StartupItems/CiscoVPN/CiscoVPN restart