The 503 (Service Unavailable) status code indicates that the server is currently unable to handle the request due to a temporary overload or scheduled maintenance, which will likely be alleviated after some delay. The server MAY send a Retry-After header field to suggest an appropriate amount of time for the client to wait before retrying the request.

What Causes 503 Service Unavailable Error in WordPress?

Here are the most common ways you might see the “service unavailable” error:

  • 503 Service Unavailable
  • 503 Service Temporarily Unavailable
  • Http/1.1 Service Unavailable
  • HTTP Server Error 503
  • Service Unavailable – DNS Failure
  • 503 Error
  • HTTP 503
  • HTTP Error 503
  • Error 503 Service Unavailable
  • Error 503 Backend fetch failed

The 503 Service Unavailable error displays inside the browser window, just as web pages do.

How to Fix the 503 Service Unavailable Error

The 503 Service Unavailable is a server-side bug, which means that the fault is normally with the website’s server. It is possible that your machine is experiencing a malfunction that is triggering the 503 error, but this is unlikely.

  • Retry the URL from the address bar again by clicking the reload/refresh button, or pressing F5 or Ctrl+R.

Even though the 503 Service Unavailable error means that there’s an error on another computer, the issue is probably only temporary. Sometimes just trying the page again will work.

  • If you’re getting the Service Unavailable – DNS Failure fault, restart your router and modem, then your machine or laptop.

Although the 503 error is almost always the fault of the website you’re using, it’s conceivable that there’s a problem with your router or computer’s DNS server setups, which a quick restart of both could fix.

  • Another option is to contact the website directly for help. There’s a good chance that the site’s administrators already know about the 503 error, but letting them know, or checking the status on the problem, isn’t a bad idea.

Most sites have support-based social network accounts and some even have phone numbers and email addresses.

  • Come back later. Since the 503 Service Unavailable error is a common error message on very popular websites when a huge increase in traffic by visitors (that’s you!) is overwhelming the servers, simply waiting it out is often your best bet. Frankly, this is the most likely “fix” for a 503 error. As more and more visitors leave the website, the chances of a successful page load for your increase.