If you get the message:
The ip of this machine () does not match the ip in the license file
when trying to start DirectAdmin (or (1.2.3.4) instead of ()) then the ethernet_dev setting in your directadmin.conf files isn't setup correctly.
Type:
/sbin/ifconfig
to see which device name your IP is on. Common devices names/formats are: eth0, eth0:1, eth1, venet0:0, etc.. Note that you can specify the sub-device name to get different IPs.
Once you know the device name, edit /usr/local/directadmin/conf/directadmin.conf Change (or add) the setting:
ethernet_dev=eth0
where you'd replace eth0 with the name of the ethernet device you should be using.