How to Fix HTTP Error 503 Cache Overload Even with Cloudflare

If you’ve ever encountered HTTP Error 503 cache overload even with Cloudflare, you know how frustrating it can be. It’s a common error that occurs when your server can’t handle the load, causing it to become unavailable to users.

As a WordPress site owner or administrator, you can’t afford to have your website down. In this article, we’ll provide you with all the information you need to diagnose and fix HTTP Error 503 cache overload even with Cloudflare.

Diagnosing HTTP Error 503

When you encounter HTTP Error 503, the first thing you need to do is diagnose the problem. The error message indicates that your server is experiencing a high load, which means it can’t handle the traffic.

To diagnose HTTP Error 503, you can follow these steps:

  • Check your server’s resource usage, such as CPU, RAM, and disk usage, to see if it’s overloaded.
  • Use a tool like Pingdom or GTmetrix to test the website’s loading speed and response time.
  • Check your server logs for any errors or issues that might be causing the problem.

Variations of HTTP Error 503

HTTP Error 503 comes in various forms. Here are some of the most common variations:

  • Service Unavailable
  • Gateway Timeout
  • Overloaded
  • Retry After

The error message you see will depend on the web server or content management system you’re using.

What Causes HTTP Error 503?

HTTP Error 503 cache overload even with Cloudflare can occur due to a variety of reasons. Here are some of the most common causes:

  • High traffic to the website
  • Server overload or resource depletion
  • Maintenance mode or update issues
  • Plugin or theme conflicts
  • CDN issues
  • DDoS attacks

Common Causes of HTTP Error 503

Let’s take a closer look at the most common causes of HTTP Error 503:

High Traffic to the Website

If your website is experiencing a high volume of traffic, your server might not be able to handle the load. In this case, you might need to upgrade your hosting plan or optimize your website to handle more traffic.

Server Overload or Resource Depletion

If your server is running low on resources, such as CPU or RAM, it might not be able to handle the traffic. You can try upgrading your hosting plan or optimizing your website to reduce resource usage.

Maintenance Mode or Update Issues

If your website is in maintenance mode or undergoing an update, it might be temporarily unavailable to users. In this case, you can wait until the maintenance is complete or revert back to a previous version.

Plugin or Theme Conflicts

If you recently installed or updated a plugin or theme, it might be causing conflicts with other plugins or themes on your website. In this case, you can deactivate or uninstall the conflicting plugin or theme.

CDN Issues

If you’re using a Content Delivery Network (CDN) like Cloudflare, it might be causing HTTP Error 503. You can try disabling the CDN temporarily to see if that resolves the issue.

DDoS Attacks

If your website is under a DDoS attack, it might be experiencing a high volume of traffic that your server can’t handle. In this case, you can contact your hosting provider to mitigate the attack or use a DDoS protection service.

Solutions to Fix HTTP Error 503

Now that you know the most common causes of HTTP Error 503, let’s look at some solutions to fix it:

Deactivate Your Plugins

If you suspect that a plugin is causing HTTP Error 503, you can deactivate all plugins and reactivate them one by one to identify the culprit.


Answer common questions regarding HTTP Error 503, such as “Can a plugin conflict cause HTTP Error 503?” and “Is upgrading hosting plan necessary to fix HTTP Error 503?”

Can a plugin conflict cause HTTP Error 503?

Yes, a plugin conflict can cause HTTP Error 503. Plugins are essential for adding functionality to WordPress sites, but they can also cause conflicts and errors, including the 503 error. If you suspect a plugin is causing the error, try deactivating the recently installed or updated plugin. If the error disappears, you’ve found the culprit. You can then look for an alternative plugin that provides the same functionality or contact the plugin developer for assistance.

note: If you’re not sure which plugin is causing the error, you can use the Health Check plugin or the Debug Bar plugin to diagnose the issue.

Is upgrading the hosting plan necessary to fix HTTP Error 503?

Sometimes upgrading the hosting plan is necessary to fix HTTP Error 503, especially if you’re on a shared hosting plan. Shared hosting plans tend to limit resources, and when your site experiences a sudden increase in traffic or resource usage, it can result in the 503 error. Upgrading to a higher hosting plan can give your site more resources and eliminate the error. However, before upgrading, it’s important to contact your hosting provider’s support team and discuss the error with them. They may be able to offer solutions to fix the issue without the need for an upgrade.

note: Keep in mind that upgrading the hosting plan is not a guaranteed solution and may not fix the error if there are other underlying issues causing it.


By following the steps outlined in this article, you should be able to diagnose and fix the 503 error cache overload even with Cloudflare. Remember to start by checking if your plugins or themes are causing the issue and then move on to other possible solutions.

It is important to note that fixing the 503 error may take some trial and error. You may need to try multiple solutions before finding one that works for your specific situation. If you are still experiencing issues, consider reaching out to your hosting provider for assistance.

To prevent future occurrences of the 503 error, make sure to keep your website optimized and up-to-date. This includes regularly updating plugins and themes, limiting the use of resource-heavy plugins, and upgrading your hosting plan if necessary.

In addition, consider implementing a content delivery network (CDN) to help distribute your website’s content across multiple servers and reduce the load on your hosting server.

Remember, a 503 error can be frustrating, but with the right tools and knowledge, it can be resolved quickly and efficiently.

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Worda Team
Worda Team

Our team of WordPress professionals will help you stay on the latest WP topics, resolve any problem or issue with the WordPress website or provide useful advice. Feel free to get in touch with us. :)

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