Connect W1 Pro to crosschex in other site via internet

Hi,
i have 3 W1 pro.
The first is on the same network of the crosschex server while the other two are in remote sites.
I tried to publish the 5010 port of the crosschex computer on the public ip address via router port forwarding.
Then i tried to connect the w1 pro to the site using client as communication protocol and using address or url for communcation. The w1 pro don’t communicate with crosschex. Moreover i’d like to uplod the user’s list to the w1 pro but it fails because it isn’t on the same lan.
How can i configure the devices and crosschex for this setup ?

Thanks