If you are getting the Defaultwebpage.cgi page on your site, please read this.
This is an error commonly caused by a recent change to your hosting account's domain names. For example changing your main domain or parking a domain may cause this behaviour.
Under normal circumstances, we would expect the error to pass after around 48 hours, although in some cases this time can be longer.
If you are still having an issue after 24 hours, please open a support ticket and someone will investigate further.