I am seeing this message too, but X-Plane is running, and I installed the plugin.
I am new to Cls2Sim and have not gotten it working yet. I can connect to the hardware, but have been consistently unable to connect to the simulator. The first time it attempts to connect, it says “a connection failed because the connection party did not properly respond in a period of time, or established connection failed because connection host failed to respond.” After that it switches to the “No connection could be made because the target machine actively refused it.”
I used the plugin installer that came with CLS2Sim. The plugin appears to be in the right place per the Brunner YouTube video. CLS2Sim is running on the same machine as XPlane. I checked the Windows firewall, and both TCP and UDP appear to be open on all ports for CLS2Sim. I’m running on Windows 10 Pro with X-Plane 11.34r1 (build 113400 64-bit).
Anyone have similar problems/ideas on how to solve them?
Thanks in advance.