Netcraft отслеживает веб-сервер / ОС marketshare.
Некоторые протесты:
What ever user(s) you have in your /etc/sysconfig/vncservers you need to have logged in or su'd to that (those) users and run vncpasswd to have it create the hidden directory .vnc in that (those) users home directory. Inside the hidden .vnc directory will be a passwd file. Once you have run vncpasswd for each user then run service vncserver start and it should load.