If, for some reason, after you configure your network or your server magically, VNC stops working. The answer is as simple as your host’s file.

root@mvd01:~# cat /etc/hosts
127.0.0.1       localhost
127.0.1.1       mvd01.takelan.com       mvd01
# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
 
# If we consider 127.0.1.1       mvd01.takelan.com       mvd01 as localhost MAKE SURE your HOSTNAME is THERE!
root@mvd01:~# cat /etc/hostname
mvd01.takelan.com

Your hostname MUST be declared in the Hosts file (as 127.0.0.x)…

After you’ve fixed that, try it again, and should be working just fine.