nDisplay: Connection Error with RsyncServer launch Failed warning

Hi, I am new to Unreal Engine and I am working with the ndisplay example file with UE4.27.

During the first time,I follow the Quick Start tutorial. I put a config file into my content browser and launch switchboard. I choose nDisplay and select my .uasset configuration file. I click “connect to listener” and “start Unreal”. Log window pop up and fail to run the nDisplay.

Then, I reopen the Switchboard, and I found the error message of RsyncServer once I launch Switchboard:

When I try to choose nDisplay and select my .uasset configuration file again, the error message said “device status change: DELETE” and “device status change: DISCONNECTED”.

I google and try to close my firewall, but it doesn’t work. I was wondering would anyone know what should I check for? I have no idea about RsyncServer.

Thank you for your attention!

Do you click Launch SwitchboardListener in Switchboard’s dropdown before click “connect to listener”?

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