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What is HTTP Error 503 and How to Fix It?

What is HTTP Error 503 and How to Fix It?

http error 503HTTP error 503 is a common issue that many people have been suffered, which occurs as frequent as some other errors like HTTP 400 error, HTTP 408 request timeout error and HTTP 500 Internet server error. When meeting this problem, your server gets into trouble.

As some readers may think that this trouble is difficult to figure out, we show you a detailed introduction about this error and list some valid solutions to fix it. In this post, we tell people the cause of this error and make it dead easy to deal with HTTP error 503.

About HTTP Error 503

HTTP error 503 is a kind of HTTP status code, also called 503 Service Unavailable. One of the main reasons that can cause this problem is the temporary overloading requests rushing to your website. When the server is not able to sustain such a heavy burden, the service will be unavailable to visitors. Then there is the HTTP error 503. There are also some other reasons may cause this issue, such as.

  • Maintenance of the server
  • The server is under hacking attacks
  • Suffer bugs
  • Data transfer is over limit

In fact, fixing HTTP error 503 is not a big mess. Only if you follow the tips we list as below, you can do it successfully.

503 error

Solutions for Webmasters

HTTP error 503 is a big mess to all the websites, which takes a bad influence on the traffic. This is because people cannot access to your website and download the web pages smoothly. Here, we list 3 valid methods for webmasters.

Check the Application Pool

Each website has an application pool. You need to check whether the application pool is still opened up. If it has been closed, the HTTP error 503 is come up. In this case, you need to start up the application pool again.

Check the Application Pool Request Queue

If the application pool is not closed, you need to check whether the request queue is over exceeded. Every website has been set the maximum number of request (the default is 1000). If the requests surpass the limitation, the site will suffer HTTP error 503. You can solve this problem by increasing the request queue.

Check the CUP Occupation

If the CUP utilization is over the given percentage, it takes up the CPU for a long time. In this circumstance, the application pool is probably closed. You just need to restart the application pool and then fix the error.

Solutions for Visitors

fix http errorAs a visitor, when suffering HTTP error 503, you can check your network conditions at first. You can refresh the web page or restart the browser. Check the detailed information in the following.

Refresh the Web Page

As a temporary issue happens occasionally, HTTP error 503 is just like an emergency situation to a website. People always suffer it when browsing a web page, but they find the page can return to normal soon. In this case, you can press F5 or the click refresh button to reload the page. And then, the web content will get right.

Restart the Browser

If the website is not compatible with the browser, it may cause the HTTP error 503. In this case, you need to restart the browser or use the other browsers to load the web page.

Ask for the Webmaster

As the 2 methods mentioned above cannot help you solve the issue, you can contact the webmaster to fix it. The technicians will take measures to check it and maintain the server. You need to wait for a while and then visit the site when it is returned to normal.


Lucy has been a very experienced SEOer, technical writer, web developer, c# developer since 2002. Now she owns a startup in San Francisco, CA, focusing on running a couple of blogs to share knowledge and experience with global readers and deliver exceptional results to global sponsors by leveraging the power of Internet.


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