HTTP 503 error (Service Not Available): Significant and Troubleshooting

HTTP 503 error (Service Not Available): Significant and Troubleshooting

HTTP 503 error is one of the most common error messages on the World Wide Web. This status code has met nearly every Internet user. In some cases it will help reload the page in question, in other cases, the error message 503 will not disappear after refreshing the browser window several times.

Accessing via desktop, tablet, or smartphone does not matter, because, with status code 503, the server notifies the visitor that the called service is temporarily unavailable (” Service is unavailable”). Exactly how this and any solution for users and server operators can be found in this guide.

What’s behind HTTP 503 code?

Error code 503 is one of many status codes that the server can use to respond to HTTP requests from clients such as web browsers. In this way, he informs the customer, for example, whether the request has been successfully processed or the next step on the part of the client is needed to process it. 503 is one of the HTTP messages reporting the server-side error of the request for the request. The message sent in this case is “Service not available” and signals to the client that the server is temporarily unavailable. The corresponding value in the “Retry later” field in the header of the HTTP response can be used to specify a point later during the request processing as likely as possible.

The exact wording of the error message may vary slightly, as the following list of some common variants shows:

  • Status Code HTTP 503 Error
  • HTTP 503
  • HTTP 503 error
  • HTTP 503 Service error not available
  • Error 503
  • HTTP server error 503
  • Error 503: Service not available
  • The HTTP / 1.1 service is not available
  • 503 Service error is not available
  • 503 The service is temporarily unavailable
  • Service not available – DNS error
  • Error 503 Maximum thread for service has been reached

When does an HTTP 503 (Service Unavailable) error occur?

HTTP 503 error occurs whenever the server is unable to deliver the requested resource at the request of the client. There are about three possible reasons for this:

  1. Servers are a bear service to record, for example, updates to ensure the database or create back-ups, and for this reason, during operation is not connected to the Internet.
  2. Servers are overloaded – getting more requests than processing. For this reason, he responds with an error message. The reason for such overloads is very different: a sudden increase in traffic is usually the cause, but the continued growth of the web project can cause overload if at the same time Resources are not upgraded. Other reasons could be malware/spam attacks and incorrect programming of web applications or content management systems.
  3. In rare cases, configuring a DNS server to crash on the client side (computer or router) may result in an HTTP 503 error message. Even the selected DNS server itself can (temporarily time) struggles with issues, so HTTP requests start leading to service announcements not available.

Here’s how you can fix HTTP 503 error

An annoying 503 error for both the visitor and the web project operator. The fact is that browser users cannot call up questionable special websites if the service provided there is needed quickly: for example, if you want to end a bank business or send the electronic message. Even those who privately or professionally rely on web applications or cloud services such as browser games, office solutions, storage platforms or project tools, do not want to wait forever until when web presence comes back.

Operators responsible for the corresponding web project should also be concerned about troubleshooting. On the one hand, the ineffectiveness of the services inevitably leads to unhappy users and loss of traffic; the other hand, common HTTP 503 problems can also worsen search engine lead rankings.

503-Error: Solution approach for customer users

If you want to access a web project using a browser and get a 503 status code to respond, you will often lack information about the exact cause. An exception to this is maintenance work already mentioned, which is scheduled by the site operator and is therefore usually identified by a custom error page 503. This page also provides information about downtime. If there is no indication that the HTTP-503 error is a result of maintenance, you can try to resolve the “no service” problem with the following tips.

Solution 1: Reload the contact page

It is possible that the server can not properly answer the requested HTTP request at specific points. In this case, it may be sufficient to reload the page to fix the HTTP 503 error. Just click the Refresh button next to your browser’s address bar, or use the [F5] key or the [CTRL] key combination. + [R].

Solution 2: Restart the computer, router, and company, or change the DNS server

It has been suggested that the cause of a 503 error may also be due to a problem with the DNS server. Most of this time it is signaled by the “Service not available – DNS error” message, which on one hand indicates a faulty DNS configuration of the system or router, otherwise, it could be a problem. the technique of the selected DNS server. While you can resolve the first scenario by restarting your device, the latter will help you switch to another server. Which step is needed for this can be found here.

Solution 3: Visit the site at a later date

If you’ve made the initiative and have no success with the refreshing attempt, restarting and configuring the DNS server, it is advisable to close the page and go to a later date to give it a try again. Since the cause is very common for people who do not have access to high traffic, it reduces the web server by the way – and returns at best, then back when this has stabilized and all HTTP requests can be handled as desired again. Of course, the same thing applies if the 503 error occurs due to maintenance, but the operator is not notified by a specific error page.

Solution 4: Contact the administrator or support site

If a site is inaccessible for a long time, you should contact the administrator or if there is support. This way, you can learn something about the background of the HTTP 503 crash and current troubleshooting situation.

Troubleshooting HTTP 503: Server Operator Options

As a site owner that’s the reason mentioned HTTP 503 error (user unhappiness, lost traffic, may be punished by search engines) your best interests to resolve as soon as possible. as well or it may not even sort to eliminate mistakes.

Of course, this is not always possible – for example, temporarily shutting down servers while maintaining your project is not stopping. However, with well-designed error pages, you have the opportunity to inform your visitors about outages. It also makes sense to name one time when your site is likely to be available again if you can estimate the time of the maintenance process. You can find other tips and tricks for handling Error Code 503 in later sections.

Solution 1: Track the necessary storage resources

Traffic is probably the biggest sticking point when it comes to HTTP 503 issues. On one hand, one of the most important goals is to attract as many visitors as possible to your own site. On the other hand, the increase in the number of visitors also increases the use of web hosting and therefore the probability of 503 errors. Therefore, it is important to monitor the number of users and increase the storage resources in time to ensure long-term stability. If you run Web projects that rely heavily on seasonal events, such as online stores from the holiday shopping season, you should also choose a storage solution that allows you to temporarily increase your storage capacity. master.

Solution 2: Regularly update the software used

If malware and spam is triggered for a 503 error, you should immediately contact your hosting provider and along with this work out a solution to the problem. To avoid such a scenario, you should pay attention to the safety of your web project from the beginning. The term, of course, your provider plays an important role – depending on the chosen server package, however, the responsibility for the protection is sometimes more, sometimes less. For example, you should always use software updates and import available updates in a timely fashion. Otherwise, legacy applications with known vulnerabilities will quickly become an attacker’s gateway.

Solution 3: Detect and fix bugs

Another cause of the HTTP 503 error generated by the server may be the incorrect programming of the Web project or the content management software used. For example, WordPress is vulnerable to 503 errors due to overloading time. This may be due to too much database access or even poorly programmable plugins, which allow the additional functionality of the CMS, but also slow performance. The same applies if you include too many extensions. The trick is to filter out problematic plug-ins so you can disable them if in doubt.