The following scenario. Two UCS installations, both configured identically for DNS:
On one system one particular web address can be pinged, on the other the following message shows up immediately:
The name or service is not known
dig @18.104.22.168 FQDN is provides the correct IP address on both systems. So I rule the DNS forwarder out as the culprit …
What else could be the reason ?
rndc flush or
/etc/init.d/bind9 restart did not help. An even after flushing the DNS cache the error message pops up immediately (not after a few seconds as expected).
Thank you for your thoughts.
Greetings - Martin