If you plan to connect to a computer located on a corporate, academic, or other network beyond your personal control, you might encounter challenges with Screens, Screens Connect, and Screens Assist. These networks, often considered "semi-public," are typically configured with heightened security measures compared to home networks and may not provide consumer-friendly services like UPnP (Universal Plug-and-Play) and NAT-PMP (Network Address Translation-Port Mapping Protocol).
To facilitate automatic port forwarding from the router's public network port to the private network port on the target computer, Screens Connect and Screens Assist rely on UPnP or NAT-PMP. Without these protocols, manual configuration of port forwarding on the router is necessary. If administrative access to the router is unavailable, and port forwarding isn't configured, Screens won't be able to establish communication with the target computer. In such cases, seeking assistance from the network administrator becomes essential.