pppd or pptpd fails when client try to connect

[Taiffu]

I have configured pptpd and pppd services with default configures which should be work.
Always that client try to connect to pptpd connection seems to FAIL.

In syslog I get this GRE: Bad checksum from pppd, this issue seems to be problem to many users and there is lots of question in forums when this error is fixed in Ubuntu.

Version information:
Description: Ubuntu 8.10
Release: 8.10

SNIPS from syslog:

Feb 15 22:09:51 server pptpd[10967]: MGR: Maximum of 100 connections reduced to 5, not enough IP addresses given
Feb 15 22:09:51 server pptpd[10967]: MGR: Maximum of 5 connections reduced to 2, not enough IP addresses given
Feb 15 22:09:51 server pptpd[10968]: MGR: Manager process started
Feb 15 22:09:51 server pptpd[10968]: MGR: Maximum of 2 connections available
Feb 15 22:29:53 server -- MARK --
Feb 15 22:33:49 server pptpd[14127]: MGR: Launching /usr/sbin/pptpctrl to handle client
Feb 15 22:33:49 server pptpd[14127]: CTRL: local address = 192.168.2.104
Feb 15 22:33:49 server pptpd[14127]: CTRL: remote address = 192.168.2.234
Feb 15 22:33:49 server pptpd[14127]: CTRL: pppd options file = /etc/ppp/pptpd-options
Feb 15 22:33:49 server pptpd[14127]: CTRL: Client XXX.XXX.XXX.XX control connection started
Feb 15 22:33:49 server pptpd[14127]: CTRL: Received PPTP Control Message (type: 1)
Feb 15 22:33:49 server pptpd[14127]: CTRL: Made a START CTRL CONN RPLY packet
Feb 15 22:33:49 server pptpd[14127]: CTRL: I wrote 156 bytes to the client.
Feb 15 22:33:49 server pptpd[14127]: CTRL: Sent packet to client
Feb 15 22:33:50 server pptpd[14127]: CTRL: Received PPTP Control Message (type: 7)
Feb 15 22:33:50 server pptpd[14127]: CTRL: Set parameters to 10000000 maxbps, 3 window size
Feb 15 22:33:50 server pptpd[14127]: CTRL: Made a OUT CALL RPLY packet
Feb 15 22:33:50 server pptpd[14127]: CTRL: Starting call (launching pppd, opening GRE)
Feb 15 22:33:50 server pptpd[14127]: CTRL: pty_fd = 6
Feb 15 22:33:50 server pptpd[14127]: CTRL: tty_fd = 7
Feb 15 22:33:50 server pptpd[14128]: CTRL (PPPD Launcher): program binary = /usr/sbin/pppd
Feb 15 22:33:50 server pptpd[14128]: CTRL (PPPD Launcher): local address = 192.168.2.104
Feb 15 22:33:50 server pptpd[14128]: CTRL (PPPD Launcher): remote address = 192.168.2.234
Feb 15 22:33:50 server pptpd[14127]: CTRL: I wrote 32 bytes to the client.
Feb 15 22:33:50 server pptpd[14127]: CTRL: Sent packet to client
Feb 15 22:33:50 server pppd[14128]: Plugin /usr/lib/pptpd/pptpd-logwtmp.so loaded.
Feb 15 22:33:50 server pppd[14128]: pppd 2.4.4 started by root, uid 0
Feb 15 22:33:50 server kernel: [18407.090363] PPP generic driver version 2.4.2
Feb 15 22:33:50 server pppd[14128]: Using interface ppp0
Feb 15 22:33:50 server pppd[14128]: Connect: ppp0 <--> /dev/pts/2
Feb 15 22:33:50 server pptpd[14127]: GRE: Bad checksum from pppd.
Feb 15 22:34:20 server pppd[14128]: LCP: timeout sending Config-Requests
Feb 15 22:34:20 server pppd[14128]: Connection terminated.
Feb 15 22:34:20 server pppd[14128]: Modem hangup
Feb 15 22:34:20 server pppd[14128]: Exit.

Best Regards
Sami

[Gergely Máté (sportember)]

Did you try the Networkmanager applet in GNOME?

[Taiffu (sami-taipaleenmaki)]

There is no any applet for configuring PPTP server in ubuntu? or are there? Is that GNOME applet purpose only configure PPTP client side?

[Chuck Short (zulcss)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. The issue that you reported is one that should be reproducible with the live environment of the Desktop CD of the development release - Karmic Koala. It would help us greatly if you could test with it so we can work on getting it fixed in the next release of Ubuntu. You can find out more about the development release at http://www.ubuntu.com/testing/. Thanks again and we appreciate your help.

[arruah (arruah)]

I've a similar error on my ubuntu jaunty on desktop when I try to connect to the server on Ubuntu.

[Igor A Tarasov (dicr)]

Please, attach output of command:
pppd file /etc/ppp/pptpd-options debug nodetach

[Jari (temppi2)]

I have same issue, system was ok before kernel update 3.13.0-45. After update I could't connect any more. mppe might be broken on this kernel?