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Issue Json problem in Wordpress

Jonas N

Basic Pleskian
Plesk Certified Professional
Server operating system version
Windows 2019
Plesk version and microupdate number
Plesk Obsidian
Hi everyone.
I have problem with a lot of my Wordpress sites " All of them "
The problem is when in widget funktion in Wordpress and we want to edit text and then save it we get the following error
Not a valid Json respond.
I have done a lot of different changes like

- New webconfig
-Changed permalinks
-Changed ssl settings and so on.
I am starting to think that this can be a firewall setting that is blocking this ?
Anyone that can help me with this ?

I can use the old widget and then it works or edit it in live mode.
But that is not the correct way in my mind = )

Kind regards
Jonas
 
I currently do not have a Windows instance of Plesk spun up to test with but make sure your URL rewrite is configured properly. Other things to check includes:
  • Making sure you're not mixing content (HTTP and HTTPS).
  • Configuration of Cloudflare or other proxies (disable it for testing if you do).
  • Make sure you don't have a define( 'WP_HOME' OR define( 'WP_SITEURL' in your wp-config.php file (or is configured properly)
  • Temporary disable the firewall and check.
  • Disable all plugins and check
 
Maybe it's related to this:
 
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