After checking your last information it seems, that you opened the WebInterface of the ctrlX CORE via the IPv6. At the moment this ip is directly copied to the target setting in the engineering and these tools cannot use it. So actually you have to insert the IPv4 by hand in this constellation. If the error will stay, please open your WebInterface of the ctrlX CORE via the IPv4 and open the engineering from there.
Could you check this two possibilities please and tell if it working at your side?
There will be some improvements in the next release RM21.03 (version 1.8.x).
... View more