PPTPD and Lotus Domino Webinterface = Kernel Freeze

Hi!

We have a problem with our pptp-Server running under Linux.

Dist: SuSE Linux 7.2 (i386) / Kernel 2.4.18-18mppe
PPTP: PoPToP v1.1.4-b4
PPPD: pppd version 2.4.1 with MPPE-Patch

The topologie is the following:

PPTP-Server ** Firewall ** Lotus Domino Server 6.x

The Problem:

If someone connect to the pptp-Server and work (NetOP, VNC,
Citrix a.s.o) all works very fine and fast. But if he use the
Webinterface
from the Lotus Domino Server after reading long emails we get a
kernel freeze (nothing work anymore). The Logfile say's nothing:

-- CUT HERE
kernel: divert: not allocating divert_blk for non-ethernet device ppp0
pppd[16728]: Using interface ppp0
pppd[16728]: Connect: ppp0 <--> /dev/pts/0
pppd[16728]: sent [LCP ConfReq id=0x1 <mru 1000> <asyncmap 0x0> <auth chap
81> <magic 0x17aaa7d0> <pcomp>
pppd[16728]: rcvd [LCP ConfReq id=0x1 <magic 0x132f5> <pcomp> <accomp>]
pppd[16728]: sent [LCP ConfAck id=0x1 <magic 0x132f5> <pcomp> <accomp>]
pppd[16728]: rcvd [LCP ConfAck id=0x1 <mru 1000> <asyncmap 0x0> <auth chap
81> <magic 0x17aaa7d0> <pcomp>
pppd[16728]: cbcp_lowerup
pppd[16728]: want: 2
pppd[16728]: sent [CHAP Challenge id=0x1
<55a1b44eb558c66881517bc00f7b275c>, name = "XXX"]
pppd[16728]: rcvd [CHAP Response id=0x1
<4c5273fd19577394151458fee0be6ccd00000000000000008 232302b82f82bd3
pppd[16728]: sent [CHAP Success id=0x1 "S=X"]
pppd[16728]: Script /etc/ppp/auth-up started (pid 16730)
pppd[16728]: sent [IPCP ConfReq id=0x1 <addr a.b.c.d> <compress VJ 0f 01>]
pppd[16728]: sent [CCP ConfReq id=0x1 <mppe 1 0 0 60>]
pppd[16728]: MSCHAP-v2 peer authentication succeeded for XX
pppd[16728]: rcvd [IPCP ConfReq id=0x1 <compress VJ 0f 01> <addr 0.0.0.0>
<ms-dns1 0.0.0.0>
pppd[16728]: sent [IPCP ConfRej id=0x1 <ms-wins 0.0.0.0> <ms-wins
0.0.0.0>]
pppd[16728]: rcvd [CCP ConfReq id=0x1 <mppe 1 0 0 40>]
pppd[16728]: sent [CCP ConfAck id=0x1 <mppe 1 0 0 40>]
pppd[16728]: MPPE 128 bit, stateless compression enabled
pppd[16728]: rcvd [IPCP ConfAck id=0x1 <addr a.b.c.d> <compress VJ 0f 01>]
pppd[16728]: rcvd [CCP ConfNak id=0x1 <mppe 1 0 0 40>]
pppd[16728]: sent [CCP ConfReq id=0x2 <mppe 1 0 0 40>]
pppd[16728]: rcvd [IPCP ConfReq id=0x2 <compress VJ 0f 01> <addr 0.0.0.0>
<ms-dns1 0.0.0.0>
pppd[16728]: Cannot determine ethernet address for proxy ARP
pppd[16728]: local IP address a
pppd[16728]: remote IP address b
pppd[16728]: Script /etc/ppp/ip-up started (pid 16732)
pptpd[16727]: CTRL: Received PPTP Control Message (type: 5)
pptpd[16727]: CTRL: Made a ECHO RPLY packet
pptpd[16727]: CTRL: I wrote 20 bytes to the client.
pptpd[16727]: CTRL: Sent packet to client
pptpd[16727]: CTRL: Received PPTP Control Message (type: 5)
pptpd[16727]: CTRL: Made a ECHO RPLY packet
pptpd[16727]: CTRL: I wrote 20 bytes to the client.
pptpd[16727]: CTRL: Sent packet to client
[a.s.o.]
pptpd[16727]: CTRL: Received PPTP Control Message (type: 5)
pptpd[16727]: CTRL: Made a ECHO RPLY packet
pptpd[16727]: CTRL: I wrote 20 bytes to the client.
pptpd[16727]: CTRL: Sent packet to client
[Here the kernel freeze]
-CUT HERE

I'm searching the internet for a while but can't find any solution
for
such kind of problems (or how to find out what happens...).

Thanks!

Best regards,
Kai.