我有一个Fritzboxconfiguration了VPN访问。 现在我正尝试在CentOS 6机器上安装一个VPN客户端。 为此，我已经安装了vpnc和NetworkManager-vpnc，我正在按照http://tosit.de/aktuelles/vpn-verbindung-unter-ubuntu-zu-fritzbox.html
但每次如果我试图连接VPN（从命令行“vpnc”）我得到的错误
vpnc: vpnc.c:1166: lifetime_ike_process: Assertion `0' failed. 另外，如果我试着用networkManager启用debugging输出（nm-vpnc-service –debug），我会得到：
** Message: <info> vpnc started with pid 13161 vpnc: vpnc.c:1166: lifetime_ike_process: Assertion `0' failed. ** (process:13150): WARNING **: <WARN> vpnc_watch_cb(): vpnc died with signal 6
在/ var / log / message（客户端）我得到：
Dec 18 19:02:30 lifebook01 NetworkManager[12964]: <info> Starting VPN service 'org.freedesktop.NetworkManager.vpnc'... Dec 18 19:02:30 lifebook01 NetworkManager[12964]: <info> VPN service 'org.freedesktop.NetworkManager.vpnc' started (org.freedesktop.NetworkManager.vpnc), PID 13282 Dec 18 19:02:30 lifebook01 NetworkManager[12964]: <info> VPN service 'org.freedesktop.NetworkManager.vpnc' appeared, activating connections Dec 18 19:02:30 lifebook01 NetworkManager[12964]: <info> VPN plugin state changed: 1 Dec 18 19:02:35 lifebook01 NetworkManager[12964]: <info> VPN plugin state changed: 3 Dec 18 19:02:35 lifebook01 NetworkManager[12964]: <info> VPN connection 'Fritzbox test' (Connect) reply received. Dec 18 19:02:35 lifebook01 kernel: tun0: Disabled Privacy Extensions Dec 18 19:02:35 lifebook01 NetworkManager[12964]: <info> VPN plugin state changed: 6 Dec 18 19:02:35 lifebook01 NetworkManager[12964]: <info> VPN plugin state change reason: 0 Dec 18 19:02:35 lifebook01 NetworkManager[12964]: <warn> error disconnecting VPN: Could not process the request because no VPN connection was active. Dec 18 19:02:35 lifebook01 NetworkManager[12964]: <info> Policy set 'System eth0' (eth0) as default for IPv4 routing and DNS.
任何人都知道这里有什么问题，或者如何得到更好的错误信息？