problem with vpn server on 10.2.8

[mouloud]

I have configured vpnd on my Mac OS X server 10.2.8 following the afp548 tutorial a year ago. It was working fine until yesterday.
I have an adsl gateway, and the clients are on mac os 10.3.3.
The connexion works fine through the local network, but I have a timout when I try to connect through internet (vpn through local network is useless, it’s just for the test) :

Apr 27 17:24:55 ServeurG4 pppd[620]: pppd 2.4.0 started by root, uid 0
Apr 27 17:24:55 ServeurG4 pppd[620]: PPTP incoming call in progress from
'81.50.0.13'...
Apr 27 17:24:55 ServeurG4 pppd[620]: PPTP connection established.
Apr 27 17:24:55 ServeurG4 mach_kernel: pptp_wan_attach, link index = 0, (ld
= 0x1d9b404)
Apr 27 17:24:55 ServeurG4 pppd[620]: Using interface ppp0
Apr 27 17:24:55 ServeurG4 pppd[620]: Connect: ppp0 <--> socket[34:17]
Apr 27 17:25:25 ServeurG4 pppd[620]: LCP: timeout sending Config-Requests
Apr 27 17:25:25 ServeurG4 pppd[620]: Connection terminated.
Apr 27 17:25:25 ServeurG4 pppd[620]: PPTP disconnecting...
Apr 27 17:25:25 ServeurG4 pppd[620]: PPTP disconnected
Apr 27 17:25:25 ServeurG4 pppd[620]: Exit.

I have a working NAT rule for the 1723 port on the gateway.

the osx firewall on the serveur is off.

Any ideas ?

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