DNS - Static Entires nslookup funktioniert aber ping nicht

Your screenshot isn't very helpful. Anyway...

Add ".local" or whatever you wish behind the name of the host. Flush the dns and should work if UTM internal ip is your dns server for the network

But why does it work for a Linux OS without a domain?

The UTM is our DNS and DHCP Server.

Regards

Jiyon

Im not an expert in linux, but maybe Linux queries the network. And they have different protocols about this.

Try my suggestion and you will not have problems.

The good thing is that you can provide the host.local (dns name) in DHCP option

Thanks, 

i added a Domain in DHCP and changed the Static Entries (DNS-hostname.domain).

Now it works fine.

Thanks for your help.