[pptp-server] Error 645 puzzle

[yan seiner]

I had been using Win95 to connect to my poptop server until recently.  I
had no need of my laptop for a while.  Now when I try to conect, I get:

Error 645: The Microsoft Dialup Adapter is in use or not responding
properly.

This used to work fine.  I have uninstalled and reinstalled windows
networking - no joy.

OK, so I looked at the logs on the server. Seems that my ISDN modem (an
Eicon DIVA LAN MODEM) does not like pptp...

Here's the snippet from the log:

Jan 14 08:09:23 aphrodite pptpd[11946]: CTRL: Client 63.85.246.20
control connection started
Jan 14 08:09:23 athena-r IP_NAT NatOut: ip:192.168.129.2 pptp T=2,
id:256 peer:256
Jan 14 08:09:23 aphrodite pptpd[11946]: CTRL: Starting call (launching
pppd, opening GRE)
Jan 14 08:09:23 aphrodite pppd[11947]: pppd 2.3.10 started by root, uid 0
Jan 14 08:09:23 athena-r IP_NAT NatOut: ip:192.168.129.2 pptp T=8,
id:0 peer:0
Jan 14 08:09:23 aphrodite pppd[11947]: Using interface ppp0
Jan 14 08:09:23 aphrodite pppd[11947]: Connect: ppp0 <--> /dev/pts/6
Jan 14 08:09:25 aphrodite pppd[11947]: Modem hangup
Jan 14 08:09:25 athena-r IP_NAT NatOut: ip:192.168.129.2 pptp T=13,
id:0 peer:1024
Jan 14 08:09:25 aphrodite pppd[11947]: Connection terminated.
Jan 14 08:09:25 aphrodite pptpd[11946]: CTRL: Error with select(), quitting
Jan 14 08:09:25 aphrodite pppd[11947]: Exit.
Jan 14 08:09:25 aphrodite pptpd[11946]: CTRL: Client 63.85.246.20
control connection finished

Could someone please give me a hand in interpreting this?

aphrodite is the pptp server. athena-r is the lan-modem.

The lan modem does NAT and the pptp server is behind the NAT.  I've been 
successful in patching ftp, for example to work behind a NATed isdn 
router.  I'm assuming that this is similar - pptpd is reporting the 
NATed address and not the real address.

My setup:

real world <-> athena (router w/NAT) <-> aphrodite (firewall w/ pptp 
server) <-> internal network

Thanks,

--Yan