The 500 error, also known as "Internal Server Error," is a major challenge when it appears on your website, especially under WordPress. This error indicates that the server encountered an unexpected problem preventing it from responding to the request. Unfortunately, it gives no precise indication of the source of the issue.
This means that to resolve this problem, an investigative approach is often necessary to identify and correct the cause of the error.
The causes of the 500 error are varied, including conflicts between plugins or themes, incorrect server configurations, corrupted files, or PHP memory limits that are too low. In this article, we'll walk you through the steps to understand, diagnose, and fix the 500 error on your site. We'll also give you advice on how to prevent such problems from happening again in the future.
What is a 500 Internal Server Error?
The 500 error is an HTTP status code signaling an unexpected condition that prevents the web server from properly processing a request. It can appear under various messages, such as "500 Internal Server Error" or simply "HTTP 500 Error." It's a "server-side" error, and particularly vague because it doesn't specify the exact nature of the problem, unlike other more explicit HTTP error codes, like the 404 error which signals a page not found.
What are the most common causes of a 500 error?
The 500 error can be triggered by various factors, including:
- Server configuration issues: Outdated or incorrect configurations, particularly in the ".htaccess" file, can be the source of a 500 error. Bad syntax or inappropriate permissions in this file can block the server from functioning.
- Plugin and theme conflicts: Whether you're using WordPress or any other CMS such as Shopify or PrestaShop, incompatibilities between plugins and themes can generate this error. A lack of regular updates can also worsen these conflicts. This is why we recommend regularly updating your CMS and checking the compatibility between your plugins and themes.
- Database connection issues: Incorrect connection credentials, a database server that's down, or a connection interrupted by a firewall can cause a 500 error.
- Corrupted files: Corruption of essential files, such as PHP files, can lead to a 500 error following a server failure, a failed update, or access rights issues.
- Resource limits: A script consuming too much memory that's required to display the page, or a server that's too slow to respond, can also cause a 500 error, particularly when scripts use more memory than the server can handle.
- Programming errors: Errors in PHP file code, including simple typos, can trigger this error.
- Server maintenance issues: Ongoing maintenance or hardware problems can also be the cause of a 500 error.
The HTTP 500 error is therefore an internal server error that can have various causes, ranging from ".htaccess" file issues to plugin or theme conflicts on websites.
How to find and identify a 500 error on your site?
To identify the source of the 500 error, it's essential to start by reviewing the server logs. A 500 error can seriously impact user experience and a website's SEO, causing a drop in traffic, sales, and your site's authority. These logs will contain details on the errors that occurred, helping to pinpoint the exact cause of the issue. Access to server logs is generally available through your hosting solution's control panel or through dedicated server management tools.
Another way to find the different HTTP errors on your site is to use a crawling tool like Screaming Frog. It lets you list all your pages and displays the HTTP code for each one, which is very useful for finding every error code on your site.
Steps to fix the 500 error
Reviewing and correcting the .htaccess file
The ".htaccess" file can be the source of a 500 error, particularly in cases of misconfiguration or syntax errors.
To fix it, access your server through your hosting interface and open the ".htaccess" file with a text editor. Carefully review each line for syntax errors or incorrect directives.
Updating file permissions
Incorrect permissions can also cause a 500 error. To address permission issues, make sure files and folders have the appropriate read and write permissions for the relevant users.
Here's how to adjust your file permissions:
- Checking permissions: Files should have permission 644 and directories should have permission 755.
- Correcting permissions: Adjust them using the "chmod" command, for example.
Updating your CMS and plugins
As explained earlier in the article, if you're using a CMS like WordPress or Shopify, it's possible that the 500 error is caused by one or more plugins.
To address this, you can disable all your plugins by going to the "Extensions" or "Plugins" section of your CMS. Once done, navigate to the page where the 500 error appears. If the error has disappeared, you can conclude that it was caused by one of your plugins.
To resolve this, simply:
- Activate plugins one by one: Once all your plugins are disabled, reactivate them one at a time and check whether the error reappears after enabling each one. This will help you identify the plugin causing the error.
- Update your plugins: If the error is caused by an outdated plugin, update it and check whether the 500 error has disappeared from your page.
- Remove the plugin: If the plugin is faulty and no longer needed, simply delete it.
Increasing PHP memory limits
PHP memory limits that are too low can also cause a 500 error, especially if your scripts are resource-intensive. To increase these limits, you have several options:
- Modifying or creating the "php.ini" file: Navigate to your "php.ini" file located at the root of your site. Once inside, find the line "memory_limit =" and enter a higher number of MB (megabytes).
- Using the ".htaccess" file: Using your FTP client, go to your ".htaccess" file to increase the limit allocated to your files. To do this, simply increase the number of MB (megabytes) in the "php_value memory_limit" directive.
- Increasing resources from your cPanel: Your hosting provider may give you access to a dashboard. In that case, head to your PHP modification tool as shown below. Once there, simply find the "memory_limit" line to increase the number of MB (megabytes).
How to prevent 500 errors in the future?
Good coding practices
To avoid 500 errors in the future, it's essential to adopt good coding practices. Here are some key recommendations:
- Using debugging tools: Use tools such as Xdebug to identify and fix syntax errors and other bugs in your PHP scripts. These tools are invaluable for preventing 500 errors by catching issues early.
- Regular testing: Regularly test your code to verify it works properly and is free of errors. Unit and integration tests are particularly useful for spotting potential issues before they go into production.
- Using stable code versions: Favor the use of stable versions of your frameworks, libraries, and plugins. Development versions may contain bugs that can cause 500 errors.
- Documentation and comments: Maintain detailed documentation of your code and add comments to explain the role of each section. This simplifies maintenance and error resolution.
Regular maintenance and updates
Proactive maintenance and regular updates are essential for preventing 500 errors:
- Updating plugins and themes: Make sure your plugins, themes, and extensions are consistently kept up to date. Updates often fix bugs and improve compatibility, thereby reducing the risk of 500 errors.
- Updating the PHP version: Keep your PHP version up to date to ensure compatibility with your scripts. PHP updates can fix incompatibilities and security vulnerabilities.
- Regularly checking logs: Frequently review your server logs to identify potential errors before they become problematic.
Monitoring your server health
Continuous monitoring of your server's health is essential to avoid 500 errors:
- Resource monitoring: Monitor your server's resources, such as memory, CPU, and disk space. A lack of resources can lead to 500 errors. Increase PHP memory limits and make sure you have enough resources to handle traffic.
- Alerts and notifications: Set up alerts and notifications to be informed of critical errors and performance issues, allowing you to respond quickly.
- Regular backups: Perform regular backups of your data and files. In the event of an error or corruption, you'll be able to restore your site quickly.
What to do if you still can't fix the error?
Contacting your hosting provider's technical support
If you're unable to fix the 500 error despite all your efforts, it's recommended to reach out to your hosting provider's technical support. Here are the steps to follow:
- To open a support ticket, most hosting providers offer this option directly from the client area or simply from the site header, often under sections labeled "Support" or "Technical Support."
- Regarding phone or chat support, several hosting providers offer a phone or online chat support service to assist you quickly with your questions and issues.
- It's also possible to contact technical support by email.
Regardless of how you choose to contact your hosting provider, always make sure to provide all necessary details, such as error messages, screenshots, and the steps you've already taken to try to reproduce the problem. This will allow the support team to handle your request more efficiently.
Conclusion
The 500 error, known as the "Internal Server Error," is a complex challenge to fix for any website, caused by a range of factors such as incorrect server configurations, programming bugs, or resource issues. Resolving it requires a methodical diagnostic approach. This involves consulting server logs, using debugging tools, and reviewing configuration files such as ".htaccess" and "php.ini".
We recommend adopting rigorous programming practices, performing regular server maintenance, and monitoring your resources. All of these practices are key preventive measures against future 500 errors. If you find the complexity of the problem overwhelming, seeking help from your hosting provider's technical support or bringing in an experienced developer can be a smart move.
By taking the necessary steps to identify and correct the sources of the 500 error, you'll contribute to the stability and improved performance of your website. This translates into an optimized user experience. Don't let the 500 error disrupt your online activity, take action to ensure your site remains accessible and efficient.
Looking for support with your digital marketing strategy? Don't hesitate to contact us!
FAQ
How do you fix a 500 error?
To fix a 500 error, here's a reminder of some practices to apply to your website:
- Check the server and application logs to identify errors that may have preceded the 500 error.
- Temporarily rename the ".htaccess" file to determine whether it's the cause of the error.
- Disable all recently installed plugins and themes, then reactivate them one by one to find the culprit.
- Check and fix syntax or configuration errors in your scripts and configuration files.
- Increase the PHP memory limit if necessary.
What causes a 500 browsing error?
The 500 error, corresponding to a server error, can be caused by various technical problems, including:
- Programming errors, such as syntax errors, infinite loops, or other code issues.
- Conflicts between plugins or between a theme and a plugin, or the absence of updates.
- Server configuration errors, such as a misconfigured ".htaccess" file, incorrect access permissions, or outdated versions of PHP or MySQL.
- Database connection issues, including incorrect connection credentials, a database server that's down, or a connection blocked by a firewall.
- Limited server-side resources, due to excessive use of memory and simultaneous processes by scripts.
- Exceeded response timeouts, with scripts taking too long to respond.
Why does fixing 500 errors improve your SEO?
Fixing 500 errors improves your SEO because they harm the user experience, increase the bounce rate, prevent search engines from accessing your pages, and reduce your crawl budget. They also send poor quality signals to Google, which can negatively impact your rankings. By ensuring your pages are properly accessible, you improve indexation, user satisfaction, and your site's technical reputation.
.jpg)
.jpg)