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 From:  "Chris Buechler" <cbuechler at gmail dot com>
 To:  "Egbert Jan van den Bussche" <egbert at vandenbussche dot nl>
 Cc:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] cannot start pptp session
 Date:  Thu, 6 Mar 2008 14:05:48 -0500
On Thu, Mar 6, 2008 at 8:37 AM, Egbert Jan van den Bussche
<egbert at vandenbussche dot nl> wrote:
> Hello!
>  W'are rtrying to get a VPN connection working between an WindowsXP PC
>  (standard client) and Monowall 1.3b9. SOme times it works but from
>  another location it does not work.
>
>  My syslog shows:
>  Mar  6 14:29:06 green mpd: [pt0] LCP: not converging
>  Mar  6 14:29:06 green mpd: [pt0] LCP: parameter negotiation failed
>  Mar  6 14:29:06 green mpd: [pt0] LCP: state change Req-Sent --> Stopped
>  Mar  6 14:29:06 green mpd: [pt0] LCP: LayerFinish
>  Mar  6 14:29:06 green mpd: pptp0-0: clearing call
>  Mar  6 14:29:06 green mpd: pptp0-0: killing channel
>  Mar  6 14:29:06 green mpd: [pt0] PPTP call terminated
>  Mar  6 14:29:06 green mpd: [pt0] link: DOWN event
>  Mar  6 14:29:06 green mpd: [pt0] LCP: Close event
>  Mar  6 14:29:06 green mpd: [pt0] LCP: state change Stopped --> Closed
>  Mar  6 14:29:06 green mpd: [pt0] LCP: Down event
>  Mar  6 14:29:06 green mpd: [pt0] LCP: state change Closed --> Initial
>  And the connection never succeeds. Icannot see which parameter is not
>  'converging'. before this closedown I see several messages about MRU
>  1400, MRRU 1600 etc.
>  Is there a way to debug the setup of a VPN a bit better?
>

The error message the client receives is likely more helpful.
Intermittent PPTP problems are almost always attributable to problems
with a firewall on the client or a firewall the client is behind.

-Chris