A static IP address (both on the local network, and externally to the Internet)
An internet connection that can support the combined bandwidth needs of the encoders and viewers
An accurate synchronized system clock (Windows will do this automatically; Linux may require an NTP client)
Ports
Specific ports opened/forwarded on any intervening Internet firewall/router for video transmission. Not opening individual ports can be used to disable access to those services from the internet. When it comes to firewall settings, make sure you also check for 3rd party firewalls.
Encoder Port 9300 (UDP)
Viewer Port 9300 (TCP) – Initial connection channel (unencrypted)
Port 9301 (TCP) – Initial connection channel (encrypted)
Ports 2048 (UDP) – Video / Full-res / Recording Download channel
Server Web Management Interface Port 9443 (TCP)