In a nutshell: occurred error is hidden behind blank white page due to errors and logging configuration options on server side.

To identify error message hidden behind blank white page, proceed with one of the following options:

• Enable display_errors and error_reporting on server side. Contact your host to get assistance.
• Check PHP error logs. Contact your host if you are not sure where your server error logs are located at.

Once error message is identified please check Errors Directory for more information on particular errors and applicable solutions.

In a nutshell: server could not find what was requested.

To fix 404 not found error select the case below that best describes your current situation:

• Error appeared when I was installing software under temporary site URL.
• My index (main) page opens fine, but all other pages result in 404 not found.
• Error appears only when I try to open custom file uploaded directly to website's root directory

In a nutshell: mistake is causing page to end up redirecting back to itself. Error message varies from browser to browser. Ex:

• Firefox: The page isn't redirecting properly . Firefox has detected that the server is redirecting the request for this address in a way that will never complete.
• Chrome: This webpage has a redirect loop

To fix mistake causing redirect loop select the case below that best describes your current situation:

• Redirect loop after signing in
• Redirect loop during software installation

In a nutshell: Something has gone wrong on the web site's server, but the server could not be more specific on what the exact problem is and therefore showed generic 500 Internal Server Error page.

To identify error message hidden behind 500 Internal Server Error page, proceed with one of the following options:

• Enable display_errors and error_reporting on server side. Contact your host to get assistance.
• Check PHP error logs. Contact your host if you are not sure where your server error logs are located at.

Once error message is identified please check Errors Directory for more information on particular error and applicable solutions.

Related documents:

Case: 500 Internal Server error for avatar upload

Case: 500 Internal Server error during software installation on 1and1 hosting accounts