I'm having the same problem with Ubuntu 11.04. My PPTP can stay up for
weeks in Windows 7 and OSX, but in Ubuntu there are frequent disconnects
(usually within 5 to 30 minutes). Here is my /var/log/syslog relating to
a disconnection:

Oct 10 05:44:27 iMac-Ubuntu pptp[11871]: nm-pptp-service-11745 
log[pptp_read_some:pptp_ctrl.c:544]: read returned zero, peer has closed
Oct 10 05:44:27 iMac-Ubuntu pptp[11871]: nm-pptp-service-11745 
log[callmgr_main:pptp_callmgr.c:258]: Closing connection (shutdown)
Oct 10 05:44:27 iMac-Ubuntu pptp[11871]: nm-pptp-service-11745 
log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 12 
'Call-Clear-Request'
Oct 10 05:44:27 iMac-Ubuntu pptp[11871]: nm-pptp-service-11745 
log[pptp_read_some:pptp_ctrl.c:544]: read returned zero, peer has closed
Oct 10 05:44:27 iMac-Ubuntu pptp[11871]: nm-pptp-service-11745 
log[call_callback:pptp_callmgr.c:79]: Closing connection (call state)
Oct 10 05:44:27 iMac-Ubuntu pppd[11861]: Modem hangup
Oct 10 05:44:27 iMac-Ubuntu pppd[11861]: Connect time 22.6 minutes.
Oct 10 05:44:27 iMac-Ubuntu pppd[11861]: Sent 36219320 bytes, received 
1371467319 bytes.
Oct 10 05:44:27 iMac-Ubuntu pppd[11861]: MPPE disabled
Oct 10 05:44:27 iMac-Ubuntu pppd[11861]: Connection terminated.
Oct 10 05:44:27 iMac-Ubuntu NetworkManager[806]: <info> VPN plugin state 
changed: 5
Oct 10 05:44:27 iMac-Ubuntu NetworkManager[806]: <info> VPN plugin state 
changed: 6
Oct 10 05:44:27 iMac-Ubuntu NetworkManager[806]: <info> VPN plugin state change 
reason: 0
Oct 10 05:44:27 iMac-Ubuntu NetworkManager[806]: <warn> error disconnecting 
VPN: Could not process the request because no VPN connection was active.
Oct 10 05:44:27 iMac-Ubuntu pppd[11861]: Terminating on signal 15
Oct 10 05:44:27 iMac-Ubuntu pppd[11861]: Exit.
Oct 10 05:44:28 iMac-Ubuntu NetworkManager[806]: <info> Policy set 'Auto eth0' 
(eth0) as default for IPv4 routing and DNS.
Oct 10 05:44:28 iMac-Ubuntu NetworkManager[806]:    SCPlugin-Ifupdown: devices 
removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
Oct 10 05:44:33 iMac-Ubuntu NetworkManager[806]: <info> VPN service 'pptp' 
disappeared

I have spoken to my systems administrator, and he says:

"According to our debug log the disconnections are caused by malformed
GRE packets. We have a lot of bad checksums on your connection."

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https://bugs.launchpad.net/bugs/225156

Title:
  pptp disconect when get some info

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