VPN PPTP 连接失败

Question

我正在尝试在我的 Ubuntu 10.10 计算机上连接到 PPTP VPN，但似乎失败了。我已经尝试在 OS X 机器上成功连接到 VPN，它确实有效。

我使用 NetworkManager 小程序连接，VPN 似乎认为我连接了一段时间，然后再次关闭并告诉我连接失败。

当我查看我的 /var/log/syslog 时，我发现：

Clio NetworkManager[1208]: <info> Starting VPN service 'org.freedesktop.NetworkManager.pptp'...  
Clio NetworkManager[1208]: <info> VPN service 'org.freedesktop.NetworkManager.pptp' started (org.freedesktop.NetworkManager.pptp), PID 3415  
Clio NetworkManager[1208]: <info> VPN service 'org.freedesktop.NetworkManager.pptp' appeared, activating connections  
Clio NetworkManager[1208]: <info> VPN plugin state changed: 1  
Clio NetworkManager[1208]: <info> VPN plugin state changed: 3  
Clio NetworkManager[1208]: <info> VPN connection 'anonine' (Connect) reply received.  
Clio pppd[3417]: Plugin /usr/lib/pppd/2.4.5//nm-pptp-pppd-plugin.so loaded.  
Clio pppd[3417]: pppd 2.4.5 started by root, uid 0  
Clio NetworkManager[1208]:    SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/ppp0, iface: ppp0)  
Clio NetworkManager[1208]:    SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/ppp0, iface: ppp0): no ifupdown configuration found.  Clio modem-manager: (net/ppp0): could not get port's parent device  
Clio pppd[3417]: Using interface ppp0  
Clio pppd[3417]: Connect: ppp0 <--> /dev/pts/2  
Clio pptp[3420]: nm-pptp-service-3415 log[main:pptp.c:276]: The synchronous pptp option is NOT activated  
Clio pptp[3431]: nm-pptp-service-3415 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 1 'Start-Control-Connection-Request'  
Clio pptp[3431]: nm-pptp-service-3415 log[ctrlp_disp:pptp_ctrl.c:738]: Received Start Control Connection Reply  
Clio pptp[3431]: nm-pptp-service-3415 log[ctrlp_disp:pptp_ctrl.c:772]: Client connection established.  
Clio pptp[3431]: nm-pptp-service-3415 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 7 'Outgoing-Call-Request'  
Clio pptp[3431]: nm-pptp-service-3415 log[ctrlp_disp:pptp_ctrl.c:857]: Received Outgoing Call Reply.  
Clio pptp[3431]: nm-pptp-service-3415 log[ctrlp_disp:pptp_ctrl.c:896]: Outgoing call established (call ID 0, peer's call ID 29301).  
Clio pppd[3417]: CHAP authentication succeeded  
Clio pppd[3417]: MPPE 128-bit stateless compression enabled  
Clio pppd[3417]: Cannot determine ethernet address for proxy ARP  
Clio pppd[3417]: local  IP address   [AN IP ADRESS]  
Clio pppd[3417]: remote IP address   [AN IP ADRESS]  
Clio pppd[3417]: primary   DNS address   [AN IP ADRESS]  
Clio pppd[3417]: secondary DNS address   [AN IP ADRESS]  
Clio NetworkManager[1208]: <info> VPN connection 'anonine' (IP Config Get) reply received.      
Clio NetworkManager[1208]: <info> VPN Gateway:  [AN IP ADRESS]  
Clio NetworkManager[1208]: <info> Tunnel Device: ppp0  
Clio NetworkManager[1208]: <info> Internal IP4 Address:   [AN IP ADRESS]  
Clio NetworkManager[1208]: <info> Internal IP4 Prefix: 32  
Clio NetworkManager[1208]: <info> Internal IP4 Point-to-Point Address:  [AN IP ADRESS]  
Clio NetworkManager[1208]: <info> Maximum Segment Size (MSS): 0  
Clio NetworkManager[1208]: <info> Internal IP4 DNS:   [AN IP ADRESS]  
Clio NetworkManager[1208]: <info> Internal IP4 DNS:   [AN IP ADRESS]  
Clio NetworkManager[1208]: <info> DNS Domain: '(none)'  
Clio NetworkManager[1208]: <info> VPN connection 'anonine' (IP Config Get) complete.  
Clio NetworkManager[1208]: <info> Policy set 'anonine' (ppp0) as default for IPv4 routing and DNS.  
Clio NetworkManager[1208]: <info> VPN plugin state changed: 4  
Clio nm-dispatcher.action: Script '/etc/NetworkManager/dispatcher.d/01ifupdown' exited with error status 1.

因此，它似乎能够连接到 VPN，但在调用脚本时遇到了某种问题：

Clio nm-dispatcher.action：脚本“/etc/NetworkManager/dispatcher.d/01ifupdown”退出，错误状态为 1。

任何人都知道如何解决这个问题？