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PPTP VPN Not establishing connection

Dev_null
I have read the other post about the GRE Error http://www.astaro.org/archive/index.php/t-10539.html not allowing connections however the VPN still will not allow connections. I think I figured out why but I cannot figure out how to fix it. 

The kernel message is:

kernel: net/ipv4/netfilter/ip_conntrack_pptp.c: bad csum

The PPTP Log is:

2006:09:09-09:02:49 (none) pptpd[26424]: CTRL: Client xxx.xxx.xxx.xxx control connection started
2006:09:09-09:02:49 (none) pptpd[26424]: CTRL: Starting call (launching pppd, opening GRE)
2006:09:09-09:02:49 (none) pppd-pptp[26425]: Plugin /usr/sbin/aua.so loaded.
2006:09:09-09:02:49 (none) pppd-pptp[26425]: AUA plugin initialized.
2006:09:09-09:02:49 (none) pppd-pptp[26425]: Plugin /usr/sbin/aua.so loaded.
2006:09:09-09:02:49 (none) pppd-pptp[26425]: AUA plugin initialized.
2006:09:09-09:02:49 (none) pppd-pptp[26425]: pppd 2.4.3 started by (unknown), uid 0
2006:09:09-09:02:49 (none) pppd-pptp[26425]: Starting negotiation on /dev/ttyp0
2006:09:09-09:02:49 (none) pptpd[26424]: GRE: Bad checksum from pppd.
2006:09:09-09:03:19 (none) pppd-pptp[26425]: LCP: timeout sending Config-Requests
2006:09:09-09:03:19 (none) pppd-pptp[26425]: Connection terminated.
2006:09:09-09:03:19 (none) pppd-pptp[26425]: Starting negotiation on /dev/ttyp0
2006:09:09-09:03:19 (none) pppd-pptp[26425]: tcflush failed: Bad file descriptor
2006:09:09-09:03:19 (none) pppd-pptp[26425]: tcsetattr: Invalid argument (line 1001)
2006:09:09-09:03:19 (none) pppd-pptp[26425]: Exit.
2006:09:09-09:03:19 (none) pptpd[26424]: GRE: read(fd=4,buffer=8055d00,len=8196) from PTY failed: status = -1 error = Input/output error, usually caused by unexpected termination of pppd, check option syntax and pppd logs
2006:09:09-09:03:19 (none) pptpd[26424]: CTRL: PTY read or GRE write failed (pty,gre)=(4,5)
2006:09:09-09:03:19 (none) pptpd[26424]: CTRL: Reaping child PPP[26425]
2006:09:09-09:03:19 (none) pptpd[26424]: CTRL: Client xxx.xxx.xxx.xxx control connection finished

Any help would be appreciated. Thanks in advance.

PS Had it working after last up2date then it failed again.


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Parents Reply
  • 0 in reply to VelvetFog
    Thanks for the link V.

    Still will not allow VPN connections via PPTP/VPN
    The kernel message( kernel: net/ipv4/netfilter/ip_conntrack_pptp.c: bad csum) is the root of the problem.

    Might have things figured out

    blackbox:/ #/sbin/modprobe ip_conntrack_pptp

    I can stop and restart PPTP VPN service via webmin and the VPN *SEEMs* to work now. May have to take it back, will monitor.



    Regards.
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