Error 500 – What is an ‘Internal Server Error’ and how does it affect SEO and website performance?

Error 500 (Internal Server Error) this is one of the most frustrating messages that both users and website owners can encounter.This is a general HTTP status code from the server error group (5xx) which indicates that the server has encountered an unexpected problem preventing it from fulfilling the request. In other words, the server knows that something has gone wrong, but cannot identify the specific cause. For the website owner, this means that the site is unavailable – and that is a sure-fire way to lose potential customers and cause problems with Google ranking.

What Does Error 500 Really Mean?

Imagine a server as a chef in a restaurant trying to prepare a dish (your website). When everything goes smoothly, you receive a 200 (OK) code. However, if something unexpected happens in the background – e.g. the sauce burns, a key ingredient is missing (script error) or the chef has the wrong recipe (incorrect configuration) – the chef is unable to serve the dish. The server then returns a general message: ‘Internal Server Error’ .

Key features of Error 500:

Server error: The problem lies in the hosting infrastructure or in the code of the website itself, not in the user's browser.

General character: The message is vague – it does not indicate a specific culprit. Diagnosis requires looking at the server logs.

Critical for Usability and SEO: It prevents access to the site, which negatively affects the user experience and may lower search engine rankings.

Why is Error 500 Bad News for SEO?

In the context of SEO (Search Engine Optimisation), frequent or prolonged occurrence of Error 500 is a warning signal for Google robots.

Loss of Indexation: If Googlebot repeatedly encounters an error, it may consider your site unstable and temporarily remove it from its index. Although this is a 5xx (server) error that tells bots to ‘try again later’, if the problem persists, your rankings may suffer.

Decline in Traffic and Conversions: Users who see an error will most likely leave the site and go to a competitor. This increases the bounce rate and drastically reduces the chance of conversion.

Decrease in Trust (E-E-A-T): A website that regularly ‘crashes’ loses credibility in the eyes of search engines, which can negatively affect its overall rating (in accordance with E-E-A-T guidelines – Experience, Expertise, Authoritativeness, Trustworthiness).

The key is to react quickly: Occasional, short-term server errors are not critical, but a persistent 500 error requires immediate intervention by a programmer or administrator.

The Most Common Causes of Internal Server Error

Diagnosing error 500 usually requires development work and insight into the server configuration. Here are the most common causes that generate this message:

Errors in the file  .htaccess: Incorrect syntax or directives in this key Apache server configuration file are a very common cause of error 500.

Exceeding PHP Limits: If the scripts on the website (e.g. in CMS systems such as WordPress) exceed the memory limit (memory_limit) or execution time (max_execution_time) assigned by the server.

Errors in scripts (PHP, Python, etc.): Most often these are typos, incompatibilities, or logical errors in the application code.

Incorrect File Permissions: Permissions (CHMOD) for files or directories that are too restrictive or too lax (typically, they should be 644 for files and 755 for directories).

Plugin/Theme Conflicts (in CMS): A new plug-in or updated theme may conflict with other elements of the system.

Database Issues: Errors in connection with the database or damage to it may also cause a 500 error.

How to Deal with Error 500?

1. Diagnosis from Logs: The first and most important step is to analyse the server logs (Error Log). This is where the server records detailed information about exactly what went wrong.

2. Remedial Measures:

Check the file .htaccess: Try temporarily changing its name (e.g. to .htaccess_old), to check whether he is the problem.

Authorisation Verification:  Ensure that the permissions for directories and files are set to the standard values (755 and 644).

Deactivating Add-ons (in CMS): Disable all plugins/modules, then enable them one by one to locate the culprit.

Increasing PHP Limits: Contact your hosting provider or change the settings in the file php.ini (if you have access), increasing memory_limit i max_execution_time.

Undo Recent Changes: If the error occurred after a specific action (e.g. update, uploading new functionality), undo this change.

Remember that quick repair of error 500 is not only a relief for the user, but above all an investment in the stability and visibility of your website on the web.

Do you require support in diagnosing and removing critical server errors on your website?
Our team of developers at MITS.pl is ready to quickly and effectively restore your website to full working order and secure its positioning.