There are a number of reasons your website at your domain may not be working.
1) If you are seeing a 'Server not found' error in your browser and/or are also having issues with other services at the domain like email there may be a DNS issue. Please check our FAQ entry Why is my domain not working? and check all possible causes there.
2) If you have cPanel hosting with us check to see if you can access your cPanel at all - you might simply be unable to connect from your location due to a block of your local IP; is my local IP blocked?
3) If you are getting any of the following HTTP errors in your browser refer the issue to your web master. If you have cPanel hosting with us you have access to the 'Error Log' tool for further details:
500 - Internal Server Error: This indicates your website is asking the server to do something it can't. If you have a .htaccess file this is a good place to start with checking for any errors.
404 - Not Found: This indicates a broken link somewhere in your site; your website is trying to load a file/page that is simply not there.
403 - Forbidden: This error is related to permissions; the resource you have asked for doesn't have the correct permissions set for you to be able to view/retrieve it.
4) If you are getting any PHP errors like 'memory limit exceeded' you can change PHP settings via the appropriate directives in a 'php.ini' file or in the appropriate configuration file for your website (e.g. if using Wordpress and you need to increase your PHP memory limit). See our How do I change PHP settings? FAQ entry for more details.
5)If you are encountering issue connecting to your hosted database, ensure to check that your site is requesting information from the correct database using the correct password and username
These details can be confirmed via your cPanels "MySQL® Databases" tool.
If you have the following or similar error message: "please contact your hosting provider and request them to enable loopback requests for your site.Error:  cURL error 28: Operation timed out after 10000 milliseconds with 0 bytes received"
This problem typically occurs when you try to connect directly via loopback IP rather than over your own hostname.
IE: The their plugin is attempting to connect to “https://127.0.0.1/path/to/file”, but cPanel cannot identify how to locate this file amongst its users.
Your plugin should be updated to connect to “https://YourDomainName.com/path/to/file” in order to complete this request successfully.