I have set up an Apex and a few home security systems on 2wires before. Do you know if your DDNS is updated to the changing IP addresses? I ran into that problem with AT&T 2wires. I ended up using a program (forgot the name) that would sync the current ip address to the ddns address. This is a design flaw with the 2 wires i have worked with, not sure which one you have. Hope that helps, Wiz.