l2tp contsant crashing, throttling respawn, but I don’t have VPN enabled ??

This is a very strange problem.

First, I don’t have VPN enabled on the machine, it’s not even listed in services but … every 10 seconds l2tp tries to launch, crashes and gets throttled. I suspect this is the root of other issues I’m having with this machine (slapd crashing which stops all users from logging in as OD is gone).

This is a brand new installation, only a couple of weeks old. Here’s the log entries:

10-01-06 5:27:32 PM	com.apple.ppp.l2tp2232	2010-01-06 17:27:32 EST	Server 'com.apple.ppp.l2tp' starting...
10-01-06 5:27:32 PM	com.apple.launchd[1]	(com.apple.ppp.l2tp2232) Exited with exit code: 2
10-01-06 5:27:32 PM	com.apple.launchd[1]	(com.apple.ppp.l2tp) Throttling respawn: Will start in 10 seconds

I’ve even tried enabling the VPN service and turning on L2TP and then turning it back off again, it doesn’t stop this constant crashing.

Can anyone give me a clue as to what might be going on here? The DNS, etc is all setup and working fine. Client is using DNS, iChat, AFP without issues (until slapd/OD dies out). The server is behind an Airport router on a private network, but is DMZ’ed and working fine both locally and remotely, hostname properly resolves, etc.

All latest updates, 10.6.2 Snow Leopard Server. Mac Mini server.

Help!