If computers are in different NAT subnets

If you want to collaborate with users whose computers reside in different subnets that use NAT (see above), it might be a good solution to set up a VPN (Virtual Private Network). A VPN allows secure communication between networks, using the internet for transferring data.

It is beyond the scope of this document to go into any details on how to set up a VPN, but make sure that your VPN will act as a single network and that the ports 6991, 6992, and, if possible, 6990 are open.