Hostname can contain only lowercase letters, numbers, dashes and dots according to RFC921, RFC952 and RFC1123

Generally the first part before the first dot is the plain hostname and the everything after that is the dotted domain name. So your hostname looks reversed. It should be hostname.xy-z.arnhem.nl. You should create a domain xy-z.arnhem.nl in foreman and then assign it to your new host with name “hostname”.

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