If WordPress experiences a "fatal" error, it will show the "Internal Server Error" page – a black + white page which will explain a number of other points / information.
The page actually has nothing to do with WordPress; it's raised by the web server software (typically Apache) as a means to display 500 errors.
HTTP errors happen on the Internet * all * the time – the most common is the famous "404" (not found) page. Each of these errors occurs on the browser level, meaning that what caused them is typically dependent on more than just the CMS you're using.
The point is that there are two types of HTTP error (4xx / 5xx), of which the "500" error is caused by server issues. In the case of your WordPress error page, this means that you have to appreciate that what you're seeing is likely the result of some defect issue with either the database, application or HTTP server for your system.
The fix typically requires digging around in the WordPress config files. Therefore, if you are not confident with anything explained below, it's recommended that you talk to a profession who 'll be able to help sort it out.
Solution
The good news is that – generally – the 500 / Internal Server Error is caused by a file on your system (not the database).
Do not fret about your posts / data – they are stored in a database, either on your own server or someone else's. It's rare for the database to become damaged – it's mostly the files which do it.
Thus, everything you need to do is aimed at getting rid of damaged / corrupted files that could be leading to the error:
1. Backup Your WP Installation Folder
The first step is to back up the WordPress installation folder, which allows you to keep a "hard copy" of the files which may become even more corrupt.
To do this, you need to gain access to the "FTP" for your server.
I'm not going to explain the specifics here – there are too many different ways to do it.
The general process is to get into the "Control Panel" of your hosting account, use that to gain access to the FTP of your account and download the WordPress installation folder to your device.
The following explains how …
Whilst most hosting companies will use CPanel (and then you get access to the inbuilt "File Manager" applet), there are some who do not have the functionality.
Because of the nature of the two types of system, the backup process alters depending on which you end up using …
The above is what most people will end up doing. If you're not using CPanel, you'll want to use the following steps:
This will allow you to save the WP folder to your hard drive, allowing you to perform the following operations with impunity.
Make sure you keep the File Manager / FTP system open.
2. Rename The "Plugins" + "Themes" Folders
As mentioned, the majority of causes of the Internal Server Error / 500 Error in WordPress is due to a file being corrupted or damaged.
The prime culprits for said damaged files are in the "Plugins" and "Themes" folders – both of which are open to being changed, and both are cited as the reason for the fatal error.
The next step is to rename the "plugins" folder on the server:
If the system does not load, then you should repeat the steps with the themes folder.
3. Rename.htaccess
The.htaccess file is used by Apache to determine different routing mechanisms for inbound traffic.
Whilst it generally works extremely well, there are often instances where it will become damaged / corrupted – leading to problems such as the one you're experiencing.
To fix this, you can simply rename the.htaccess file in your hosting service – which can be done using the following steps:
If you follow these steps, it * should * give you – at least – rudimentary access to the WordPress admin section again – from which you'll be able to rebuild the various plugins etc.
If none of the above steps work, it suggests that you have a defect issue with the system. The most important thing is to not panic – all your posts / settings are stored in the database, meaning that even if you have to do a complete re-install, you'll still have them.
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