UE 4.22: nDisplay Launcher does not start nDisplayListener(s)

I moved to Unreal Engine 4.22 and really liking the new nDisplay implementation; the configuration of windows, screens, and viewports adds a lot more flexibility. I’ve also managed to insert it into an existing C++ project with no problem.
I am running into one strange issue though… the nDisplay Launcher seems to function differently than in 4.21 and earlier, which had buttons for Start Listeners and Stop Listeners. In 4.22, there is simply a Run button, but it doesn’t seem to start the nDisplayListeners. Instead I get the following error message in the Launcher (no log is generated):

An error occurred while sending a command to XXX.XXX.XXX.XXX. EXCEPTION: No connection could be made because the target machine actively refused it XXX.XXX.XXX.XXX:41000.

Everything runs fine if I manually launch any nDisplayListener.exe before clicking Run in nDisplayLauncher. Is this a bug or is there something I may be missing? I’m otherwise following the docs to a T.

P.S. Is VR/AR the correct forum for nDisplay?

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I have the same issue. Did you find a solution ?

The solution : do not forget to start the ndisplaylistener on each node.