[Openswan Users] Intermittent disconnections

[Ryan]

I have an FC3 box set up with openswan 2.3.0 and X.509 certificates for
authentication.  I'm trying to connect with a Windows XP SP2 box.  The XP
box is behind a router, but the FC3 machine is connected directly to the
internet.   I set it up roughly to this guide:

http://www.natecarlson.com/linux/ipsec-x509.php

It connects and functions fine for a while, but then it disconnects. Here
are what I think are relevent pieces of /var/log/secure.  At first I see
this many many times:

Apr  4 15:35:00 eri pluto[18065]: "roadwarrior-l2tp"[5] EXTIP:60440 #87:
received and ignored informational message
Apr  4 15:35:00 eri pluto[18065]: "roadwarrior-l2tp"[5] EXTIP:60440 #87:
received Delete SA(0x4f92d467) payload: deleting IPSEC State #212

With one line of this mixed into it:

Apr  4 15:33:20 eri pluto[18065]: ERROR: netlink XFRM_MSG_DELPOLICY
response for flow int.0 at 0.0.0.0 included errno 2: No such file or
directory

After those, I see many many lines of this:

Apr  4 15:35:04 eri pluto[18065]: "roadwarrior-l2tp"[6] EXTIP:60440 #195:
sending notification PAYLOAD_MALFORMED to EXTIP:60440
Apr  4 15:35:04 eri pluto[18065]: "roadwarrior-l2tp"[6] EXTIP:60440 #195:
next payload type of ISAKMP Hash Payload has an unknown value: 146
Apr  4 15:35:04 eri pluto[18065]: "roadwarrior-l2tp"[6] EXTIP:60440 #195:
malformed payload in packet

Then it is disconnected.

I've tried googling for the different error messages, but I can't find
anything that helps much.  Anyone have any ideas on where to start?  I'll
post config files if it helps.  Thanks for any help!!

Ryan