How to Fix a 503 Service Unavailable Error Message

What to do when a website’s server is down

The 503 Service Unavailable error is an HTTP status code that means the website’s server is currently unavailable. Most of the time, this happens because the server is too busy or there is maintenance on it.

Are you the web administrator? Watch the Fix 503 errors on your own site further down the page for a few things if you don’t know what to do.

A 503 error message can be customized depending on the website it appears on or the server software that generates it, so how you see it may vary. very.

503 Service Unavailable errors can appear in any browser on any operating system, including Windows 10 through Windows XP, macOS, Linux, etc., even on your smartphone or other non-traditional computers. If you have Internet access, you may see a 503 in some situations.

How you can see the 503 error

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

  • 503 Service Not Available
  • 503 Service Temporarily Unavailable
  • Http/1.1 Service not available
  • HTTP 503 server error
  • Service not available: DNS failure
  • Error 503
  • HTTP503
  • HTTP 503 error
  • Error 503 Service Not Available
  • Error 503 Failed to fetch backend

The 503 Service Unavailable error appears in the browser window, just like web pages.

Sites that use Microsoft IIS can provide more specific information about the cause of a 503 Service Unavailable error by adding a number after the 503like in HTTP Error 503.2 – Service Unavailablemeaning Concurrent request limit exceeded. To see More ways to see a 503 error down the page for the full list.

How to Fix Error 503 Service Unavailable

The 503 Service Unavailable error is a server-side error, which means that the problem is usually with the website’s server. Your computer may have a problem causing the 503 error, but it’s not likely.

Life Wire / Jie En Lee

Anyway, you can try several things:

Retry the URL from the address bar by clicking the reload/refresh button or pressing F5 either CTRL+R.

Even if the 503 Service Unavailable error means there’s an error on another computer, the problem is probably only temporary. Sometimes just retrying the page is enough.

If you receive a 503 Service Unavailable error message when paying for an online purchase, please note that multiple payment attempts may result in multiple orders and multiple charges. Most payment systems and some credit card companies have protections against this sort of thing, but it’s still something to be aware of.

Reboot your router and modem. Then restart your computer or device, especially if you see the Service not available: DNS failure Error.

Although the 503 error is always the fault of the website you’re visiting, there could be a problem with the DNS server settings on your router or computer, which a simple reset of both might fix.

If restarting your computer didn’t fix the 503 DNS failure error, there may be temporary problems with the DNS servers themselves. In this case, choose new DNS servers from our list of free and public DNS servers and update the servers on your computer or router.

Another option is to contact the website directly for help. Site administrators are most likely already aware of the 503 error, but letting them know or checking the status of the problem is not a bad idea.

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

If the website providing the 503 error is popular and you think it might be completely down, check to see if the website is down by connecting its URL to a service like Freshping’s Is it down tool. A clever search on Twitter can also give you the answer. try searching #websitedown on Twitter, replacing website with the name of the site, as in #facebookdown or #youtubedown. An outage at a major site usually generates a lot of discussion on Twitter.

Come back later. Since the 503 Service Unavailable error is a common error message on trendy websites when a massive spike in visitor traffic overwhelms servers, waiting is often enough. Frankly, this is the most likely “fix” for a 503 error. As more visitors leave the website, the chances of the page loading increase.

Fix 503 errors on your own site

With so many different web host options and even more general reasons why your a service could be unavailableThere is no simple “thing to do” if your site gives your users a 503.

That said, there are definitely places to start looking for a problem and then hopefully a solution.

Start by taking the message at face value: did something crash? Restart any running processes and see if that helps.

Beyond that, look for not-so-obvious places where something might have wobbled. If applicable, review connection limits, bandwidth throttling, general system resources, failovers that may have been triggered, etc.

In what is probably a “double-edged sword” for your website, it can suddenly be very, very popular. Getting more traffic than your site designed to handle almost always triggers a 503.

However, the 503 error can also be caused by a malicious denial of service (DoS) attack. If so, it would be a good idea to contact the company that hosts your website to discuss what steps you can take to reduce the likelihood of it happening again or to better prepare for another one in the future. .

An unintentional DoS attack can even occur, when a virus on the server sucks up usable system resources and slows down the server to the point of causing a 503 error.

More ways to see a 503 error

In Windows applications that inherently access the Internet, a 503 error may be returned with the HTTP_STATUS_SERVICE_UNAVAIL error, and maybe also with a The service is temporarily overloaded. message.

Windows Update may also report an HTTP 503 error, but it will show up as error code 0x80244022 or with a WU_E_PT_HTTP_STATUS_SERVICE_UNAVAIL message.

Some less common messages include 503 Quota Overflow Y Login failed (503)but the above troubleshooting still applies.

If the website reporting the 503 error is running Microsoft’s IIS web server software, you might receive a more specific error message like one of these:

IIS 503 errors
status codereason sentence
503.0Application pool not available
503.2Concurrent request limit exceeded
503.3ASP.NET queue full
503.4FastCGI queue full

Errors like 503 Service Unavailable

The 503 Service Unavailable error is a server-side error. It is closely related to other server-side errors such as 500 Internal Server Error, 502 Bad Gateway Error, and 504 Gateway Timeout Error, among others.

There are also various client-side HTTP status codes, such as the standard 404 Not Found error, among others.

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