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I can't explain it, I didn't change anything but it seems suddenly today one of my websites on my Plesk environment (Plesk on Ubuntu) is suddenly white. No error, no php errors, nothing (even with define( 'WP_DEBUG', true ); or any other method that would help me find something.

Also the error logs for the domain don't seem to return anything helpful.

As it's Wordpress I tried to rename the plugin folder, theme folder, checked .htaccess, other configs.

But … 

I only get a completely empty page when I inspect it. 

<html>
    <head></head>
    <body></body>
</html>

I'm running PHP 7.2.19 with "FPM application served by nginx" but also switching to some other PHP version, updating parameters or switching to apache-serving doesn't do anything.

I also checked other domains on the same Plesk installation, that work all fine.

Any ideas here?

matt
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  • Could it be due to an auto update that has gone wrong? Do you see the `.maintenance` file on the root folder? – ibex Jun 27 '19 at 23:41

1 Answers1

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Before you give these solutions a shot I recommend that you restart your server first as the problem might get solved by itself because we know that plesk does a lot of updating in the background.

Solution 1

Access your error logs /var/www/vhosts/yoursite.com/logs/access_log and check if there are 500 errors in there. Meaning that you need to allocate more Memory in the PHP settings of plesk (Plesk > Your Website > PHP Settings) e.g 256 or 512 MB.

Don't forget to add define('WP_MEMORY_LIMIT', '256M'); in your wp-config.php

Solution 2

Rename /plugins/ folder to /plugins.old/ and create a new empty plugins folder then go to /wp-content/ and remove advanced-cache.php. Also in wp-config.php check if you have define('WP_CACHE', true); then change it to false.

Solution 3

Your theme could be broken so switch to any default theme to find out.

Solution 4

Go to Plesk > Your Website > PHP Settings and enable errors. Then add "define( 'WP_DEBUG', true );" into your wp-config.php. Try to Visit your administration panel and view random webpages to see the errors as they could give you a clue of what is going on. Then you can google whatever error.

Solution 4

Go to Plesk > Your Website > Settings > Switch To FastCGI/PHPFPM, Apache/Nginx, etc. Try all of those in combination with different PHP versions.

Solution 5

Turn off Mod Security from Tools & Settings > Web Application Firewall (ModSecurity)

Community
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MrJack Mcfreder
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  • Thank you for your help. Nothing of those 5 things did the job. 1.) The access_log is empty! 2.) Even though I have error reporting on and also specified it in the wp-config.php with error_reporting(E_ALL) and other DEBUG options, I do not get anything but a white page. 3.) I renamed plugins and theme, but nothing happens. – matt Jun 28 '19 at 05:38
  • download latest wordpress https://wordpress.org/download/ then extract and replace all the files on your website. Also SSH login to your server and check the group and user permissions using `ls -l` terminal command. – MrJack Mcfreder Jun 28 '19 at 09:37