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When I try to add or edit a product, I get blank page with Error 503: Service Unavailable
The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.

In the past 2 month I have created a lot of extensions and all are working fine. The products are shown in the product grid, no problems.

All modules in Admin are working, a maintanance.flag file does not exist.
I disabled all my new modules, nothing works, I am not able to add or edit a product. I dont know what to do, we would like to start next week with our shop.

PLEASE, PLEASE HELP.

Christian

Did you check the Server error log files? i mean apache or nginx error files?
maybe you can find something useful.

There are so many error notifications in the web technology & in the server status notification one of them is as follows:

503 Service Unavailable Error

This errors mostly comes when there is some maintenance work going on into the server & other than that mostly when the server is too busy & not able to respond to the request.

There can be so many possibilities for this but in Magento as per my observation this error comes when we are having some code issue that is when we have invoked any method which requires so much time to respond or when we have printed an object or something with very huge content of data.

To trace this you can take the following steps:

• Please check your log files.


• Please enable/allow the error message to be shown on the front-end. To do this put the below code into your index.php file present at your root as well as present in your pub directory.

Code to be placed in index.php

ini_set('display_errors', 1);

error_reporting(E_ALL);

Note: Make sure you are in the developer mode because if you are in
production mode it is possible then also it will not show any error
message on the front-end. Please re deploy your site with the
following commands from the command prompt/terminal.

php bin/magento maintenance:enable

php bin/magento setup:upgrade

php bin/magento setup:di:compile

php bin/magento setup:static-content:deploy

php bin/magento maintenance:disabled

php bin/magento cache:flush