OK, some progress. I changed the Windows Filter settings to use MD5/3DES instead of MD5/DES which it set to by default. I connect just fine. Now. Here's the thing. When I disconnect, I loose the ability to connect through the ASL box to the internet. Other machines can still get out. If I change my IP, I can get out too. If I change it back to the IP it was while using L2TP/IPSEC I still can't get out. After a few minutes I can but for a solid 5 minutes or so I can't get anywhere.
Yeah, probably what happened is in the network options for your vpn, you set it to automatically get an IP address. You might have to leave this setting be, and just release and renew your IP address when you finish with it. If you're lucky, you might be able to set it up with a static IP address, but it also depends on your office's policies about that sort of thing.