I have bought a Digi One SP and I have connected it to my modem. I want to “map” this COM port through the internet and therefore also through two firewalls.
Scenario - I have placed my Digi One SP in one location (place 1), behind a firewall and the IP address is NAT’ed. I have also placed my server on another location (place 2), behind a firewall and also NAT’ed.
I want to receive incoming calls from place 1 to my software on my server at place 2.
I can not even setup the driver at the server, so I guess it has something to do with the ports at the firewall, as the configuration works fine inside the locale net at place 1.
What ports have to be opened where? Right now I have opened port 771,2000,2001,2101 at the place 1 firewall and all outgoing traffic is allowed outside place 2 firewall.
What to do?