Okay, I'm at wit's end here. I've Googled and researched and troubleshot and posted to Linksys' forums with no luck, so I figured maybe I'll post here. I have an RVS4000 serving as the gateway for our LAN. Behind the RVS, I have an Xserve running an L2TP VPN, which is tied to the users & groups permissions for the Xserve itself. Because of this, I can't use the VPN built into the RVS4000, so I'd like to simply pass all VPN traffic through the RVS4000 to the Xserve. A simple port forwarding, thanks. And it doesn't flippin work. I know the VPN on the Xserve is configured correctly because with plain ol' port forwarding on the ancient NetGear wired router, it worked fine. (We only upgraded because we needed a firewall and more port forwarding slots & port range forwarding, which the 7-year-old Netgear lacked. Plus it was slow as dirt.) I'm not comfortable with trying new beta firmware unless I know for certain that it will fix this problem. Other than that I've changed the MTU settings, put the Xserve as a DMZ host, and toggled a bunch of settings (IPS, rest to factory defaults, etc.) Nothing works... Client machines (OS X 10.4 and 10.5) get the same error after trying to connect for 45-60 seconds: "The connection has failed. Please verify your settings and try again." My RVS4000 config is as follows: Firmware: V1.1.09 VPN: not configured DDNS: off IPSec, L2TP, and PPTP PassThrough: Enabled Ports 500, 1701, 1723, and 4500: forwarded to the appropriate internal IP All other forwarded ports -- pointing to the Xserve and various other boxes -- work fine. Any thoughts or suggestions?