Unexpected error from server. Please check browser console

I also checked with my server host and they indicate that the REST API service is competing to be used and thus broken as a result of this security plugin by Cleantalk. So it’s preventing the REST API from working.

Hello @parhamm.

Please check that this option is disabled:

WordPress Admin Page → Settings → Security by CleanTalk → General Settings → Disable REST API for non-authenticated users.

If it didn’t help, please contact us via our private Ticket System: https://cleantalk.org/my/support/open. We need additional details about your website.

Thank you Eugene. I tried to uncheck (disable) the setting you suggested, but it didn’t make a difference.

I will open a ticket.

Thank you. Let’s continue our conversation there.

Because of the page cache, the update process of Security FireWall went to direct (that is, a piece of data was downloaded from the cloud and immediately written to the database, without intermediate storage of these files in uploads).

Since the volume of personal lists is large, this led to exceeding the max_execution_time in the php.ini settings.

The solution is either to increase the max_execution_time to 240, or to add the following code to .htaccess:

<IfModule mod_dtimeout.c>
<Files ~ ".php">
SetEnv DynamicTimeout=300
</Files>
</IfModule>