If you are the owner of this website, please contact your hosting provider

If you are accessing a domain name and you get a message stating that

SORRY!
If you are the owner of this website, please contact your hosting provider: webmaster@example.com

you should know that the message is displayed because the account for the respective domain name doesn’t exist on the server.

cPanel suggests the following possible causes for this situation:

The IP address has changed.
The IP address for this domain may have changed recently. Check your DNS settings to verify that the domain is set up correctly. It may take 8-24 hours for DNS changes to propagate. It may be possible to restore access to this site by following these instructions for clearing your dns cache

There has been a server misconfiguration.
You must verify that your hosting provider has the correct IP address configured for your Apache settings and DNS records. A restart of Apache may be required for new settings to take effect.

The site may have moved to a different server.
The URL for this domain may have changed or the hosting provider may have moved the account to a different server.

To check from the server-side if the account is present on the server you can use the cPanel script from /scripts/whoowns

root@web [~]# /scripts/whoowns example.com
root@web [~]#

If there is no result it means the account doesn’t exist on the server. The next step in the investigation will be to check the nameservers/A record for the domain name.