I'd like to switch to English to get the information available for as many persons as possible.
Please have a look to to the official quick start guide for ctrlX CORE to see how to connect in the first place. Also a collection of all how to videos and blogs with several information can be found here.
Pinging the ctrlX CORE works just like you do it for all other devices also. Open a terminal and use ping <IP>. Please make sure that it is reachable via the network and no vpn or firewall is blocking the communication.
EDIT: See picture:
Ubuntu ping ctrlX CORE
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