what is the PDMS Global version and fix you are using... in some versions you have install the latest fix....
was the daemon running and the communication between two locations successful?
IP address adding is mandatory if the Global connection is established by a SSL VPN.....
Are you using any VPN to bypass the firewall.....
if not IP address adding is not required....
As the communication is one way I suppose the satellite port opened is not reading the required IP address or the required port at satellite is not opened..... check with HUB requirement to open the ports.....