I am trying to set up 1 EX2 in my home office as a backup to an EX2 in a business office 20 minutes away. In the process of setting up the 1st one now. I use a Uverse 3800HGV-B router at home and have set open ports 21, 22, 873, and 443. I have checked all ports using yougetsignal.com and the Network Utilities PortForward program. Both report the ports open. In the Port Forwarding section of the EX2 for each of these ports it says "checking" then FAILED. Why would it fail if the ports are open? I don't want to go set up at the office Friday and have to bounce back and forth trying to get these systems to talk to each other.
The one at home will do nothing but mirror the business office for a fail safe backup.