Your hostname, , and the servername you have set in DirectAdmin, server.host.com, do not match.
where the hostname is blank (note the ", ,"), a reported cause of this is an incorrectly setup /dev/null file./bin/hostname --fqdn
to ensure you get something displayed.rm /dev/null
mknod -m 0666 /dev/null c 1 3
hostname: Name or service not known
is to edit your /etc/hosts file, and change:1.2.3.4 your.hostname.com
to be:1.2.3.4 your.hostname.com your
such that you have both the long and short forms of your hostname beside your server IP.Your hostname, bob.host.com, and the servername you have set in DirectAdmin, server.host.com, do not match.
it means you just need to update the hostname: