Trying to enable Internet access using UPnP, using Server 2.1.5, and I'm receiving the "Possible double NAT detected" message. I do have a Vonage device between a Comcast cable modem and a Linksys WRT54GL router- -I'm assuming the Vonage device is the culprit. Without moving the Vonage device behind the router, is there another way to get the Remote access to work?
You make to have sure that you have NAT and DHCP server enabled only on the outer most device. That would be your cable modem if it is a router. If it is just a modem and doesn't have DHCP server/NAT functionality then it should be in the device connected to it.