Like you said there is quite nothing to do wrong. I just prepared the topology like used in the how to mentioned above.
I connected to a switch:
port XF10 of a ctrlX CORE one using IP 192.168.1.1 (system version 1.20.5)
port XF10 of a ctrlX CORE two using IP 192.168.1.2 (system version 1.20.5)
and my network port of my PC using IP 192.168.1.87 (Windows 10)
ctrlX CORE web UI - network settings
Afterwards I entered the control as remote device to each other and communication was immediately working:
ctrlX CORE web UI - remote data layer connection
Without having some information about your setup and corresponding IP settings it is just guessing what could be wrong. Are there more devices using the same IP in your network? Are your controls connected to bigger company network with a bigger network architecture? Which system apps versions are you using on each control? Are you using correct username and password?
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