[pptp-server] Errors connecting

[Ben Reed]

I have a server running pptpd 1.0.0 with the ppp patches applied to ppp
2.3.10, kernel 2.2.13.  A client is trying to connect through the net to my
machine.  The client is a Win98 machine behind a linux masquerading
firewall.

When he tries to connect, he gets a 650 error, and I get the following to
my syslog:

--- (begin) ---
Oct 28 23:00:57 router pptpd[22756]: CTRL: Client 205.139.250.14 control
connection started
Oct 28 23:00:57 router pptpd[22756]: CTRL: Starting call (launching pppd,
opening GRE)
Oct 28 23:00:58 router modprobe: can't locate module char-major-108
Oct 28 23:00:58 router pppd[22757]: pppd 2.3.10 started by root, uid 0
Oct 28 23:00:58 router pppd[22757]: Using interface ppp0
Oct 28 23:00:58 router pppd[22757]: Connect: ppp0 <--> /dev/pts/4
Oct 28 23:01:28 router pptpd[22756]: GRE:
read(fd=4,buffer=804d8c0,len=8196) from PTY failed: status = -1 error =
Input/output error
Oct 28 23:01:28 router pptpd[22756]: CTRL: PTY read or GRE write failed
(pty,gre)=(4,5)
Oct 28 23:01:28 router pptpd[22756]: CTRL: Client 205.139.250.14 control
connection finished
Oct 28 23:01:28 router pppd[22757]: LCP: timeout sending Config-Requests 
Oct 28 23:01:28 router pppd[22757]: Connection terminated.
Oct 28 23:01:28 router pppd[22757]: Exit.
---- (end) ----

Any ideas what's going on here?  Is his firewall maybe getting in the way
(i.e. does he have to allow a certain port through)?  Normally, assuming he
instigates the outgoing connection to me, it will allow incoming from me. 
We've tried playing with various settings, but nothing really changed.

I would appreciate any help you can pass along.

Thanks,
Ben Reed (ranger at befunk.com)
http://defiance.darktech.org/