If you would like to let the administrators of this website know that you've seen this page instead of the page you expected, you should send them e-mail.
In general, mail sent to the name "webmaster" and directed to the website's domain should reach the appropriate person.
If you can read this page it means that the Apache HTTP server installed at this site is working properly.
The fact that you are seeing this page indicates that the website you just visited is either experiencing problems or is undergoing routine maintenance.
Cent OS conforms fully with the upstream vendors redistribution policy and aims to be 100% binary compatible.