I have two Godot projects, one for the client game and one for the server that performs all of the game state logic. A remote function is to be called using rpc_id() by the server after a connection is established. I do not expect an issue with the project code itself, as when testing on the local network within the editor for both projects everything works fine. I suspect the issue lies with the generated .pck file used when exporting for a Linux server. I went so far as running Wireshark to confirm that I was receiving relevant packets when the RPC was sent. The packets are making it back from the server, but no incoming RPCs are being detected in the Godot Network Profiler. Could there be some security setting that is stopping external RPCs from being called? Could it be that exporting to a .pck is somehow interfering with Godot's attempts to find the matching node that contains the remote function?