W3 Cache redirects to front page when I press purge all caches

Question

I migrated my site to a new server. Everything seems to be fine, but the browser is redirected to the frontpage when I save configurations in either the "W3 Total Cache" plugin or in "Duplicate post" plugin. It does save the edits, but it´s annoing with the redirect.

For example when I press purge all caches from W3 Cache, it is redirected to

www.mysite.com/?w3tc_note=flush_all

I can´t find a solution that solves it. I tried with:

define('WP_HOME','http://example.com');
define('WP_SITEURL','http://example.com');

In my wp-config.php

And with these google results: Redirecting to home-page when saving any edited code https://wordpress.org/support/topic/wordpress-5-0-beta3-redirects-to-wp-admin-edit-php-after-hitting-enter-key/

I also looked at the wp_options in the DB. But seems allright.

I tried to change the wp permanent link options in the admin settings too.

The "Duplicate post" plugin was installed after the site migration.

Answer 1

Okay, I found a solution. To anyone in the future having this problem here's what i did:

• I used the plugin "Duplicator" and made a package of the site.
• Then i downloaded the installer and the archive.
• I then deleted everything in the database and on the ftp.
• Then I transfered the archive and installer file to the FTP and run the installer.php

Now everything works again :)

Answer 2

It's because you have set the Referrer Policy header incorrectly set in the W3TC page cache.

Referrer Policy
This header restricts the values of the referer header in outbound links.
**Directive: same-origin**

...will fix it. If your overall Directive is "same-origin" and you set the Referrer header to something different (such as "origin"), this error will occur. I changed mine to same-origin and the problem was immediately fixed.

Answer 3

It is a bit hard to really know what is going on. But a best "guess" is that you have a plugin that is redirecting and/or conflicting with the theme. By process of elimination, I would deactivate all the plugins and see if the problem still exists. If it disappears, reactivate, one by one. Somewhere there is a conflict and doing a redirect.

A secondary effort would be, after all the plugins have been disabled and assuming it still exists, then change themes.

You have to narrow this down to the most basic element.