SSH to your appliance or access the console and login as root...
Next, edit your /etc/hosts file
- Remove all reference to your FQDN and hostname in there, the only things you'll want is along the lines of:
127.0.0.1 localhost
Optionally restart the network service (may not be required, I did on mine)
After doing this, my appliance started showing the fqdn when I selected the proper IP in the configuration.