Hi,
I was not able to reproduce your error. I connected the ctrlX CORE to a free internet (not company controlled) and connected with my laptop to the ctrlX CORE and was able to download the palette "node-red-contrib-ui-led" you mentioned.
I would suggest to look at the time settings of your ctrlX CORE, please check if your time is set correctly. The time has to match with the server time. This is also mentioned in the troubleshooting part of the node-red-contrib-ctrlx-automation.
Best regards,
Nick
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