Hello,

I've got the problem with L2TP over NAT in Vista Business...

The scenario is following:
- Windows Vista Business with private IP address (192.168.x.x/24 network)
- ASUS 500gx with NAT
- Internet
- Cisco 2600 series with NAT (ports UDP 500, 4500, 1701 + ESP forwarded to
RRAS server + PPTP opened too)
- Windows 2003 with RRAS installed (10.x.x.x/24 network) with L2TP enabled
(pre-shared key)

Symptoms:
- Connection from Vista to RRAS server does not pass through
- PPTP connection from Vista to RRAS server works just fine
- Connection from WinXP (on the same network) using L2TP with registry
changes according to KB818043 works just fine
- Hotfix from KB912213 didnt help
- Registry tweak mentioned on this page:
http://www.jacco2.dds.nl/networking/...wan.html#NAT-T didnt help

Any ideas?

thanks,
jb