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I'm not unfamiliar with a Magento 503 error. However, for a client I'm getting this error without any markup to the page as well and the full error reads:

The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.

Additionally, a 503 Service Unavailable error was encountered while trying to use an ErrorDocument to handle the request.

Normally I would start looking for the "maintenance.flag" file, empty my cache, deactivate and clear compiler or see if there have been any new extensions installed. I've done all this just to be sure but especially the last sentence gives me the idea this is a problem outside of Magento. I'm also not able to access the backend as this throws the same 503 error.

What I've also done is uploading a ".html" file which is returned normally. Uploading a ".php" to the root is NOT rendered and returns the 503... What does this tell me?

What steps other that described can I take to be more sure?

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500 errors come from one of two places.

  1. 503 is set as a maintenance server status return by Magento via the existence of maintenance.flag in the Magento root folder. This is often left behind by using Magento Connect in order to install something and the cleanup after the install didn't remove it.

  2. 503 (or other 500 status codes) is being sent out by the web server itself due to a coding error so egregious that it causes the web server to crash. This can be due to bad coding in .htaccess, php files, etc and when this happens, the cause will be written to the web server's error logs (not Magento's logs) or even throw php error log entries.

Uploading a ".php" to the root is NOT rendered and returns the 503... What does this tell me?

You will need to examine your web server error logs to see if error entries are being generated, also you need to put Magento into developer mode with full error display (if it's only the above .php script that's doing it, you will have to enable debugging in it) in order to find your coding error.

This page will give you help on the debug process: Fundamentals for debugging a Magento store

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  • Thanks for your prompt answer. Obviously 1 is not the case. 2 Might be the case though it's highly unlikely as you would have to put in some pretty bad code to get it to crash. I've examined the problem further and accessing the site via IP does give me some result (homepage with some fudged-up styling). It almost looks as if the URL is giving problems... – Badger Mar 12 '16 at 22:34
  • forgot that maintenance.flag causes every page to throw a 503, many thanks man! – nicolallias Dec 26 '17 at 15:24
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Most of the time(80%) it will be your PHP error for me it due to php errors, so don't diverted on server issues check your logs or debug your code properly.

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