I found the mistake! Outside of IPFire! The name servers of the DynDNS provider are not synchronized. In the secondary NS is still the old IP.
I was just lucky with the idea to query the two nameservers individually.
Thank you so much for your help.
I found the mistake! Outside of IPFire! The name servers of the DynDNS provider are not synchronized. In the secondary NS is still the old IP.
I was just lucky with the idea to query the two nameservers individually.
Thank you so much for your help.