Failed to load resource: the server responded with a status of 404 (Not Found) admin-ajax.php while insert image in to post, and when I add custom html widget in to side bar this error will appear. I am using tinymce advanced editor and wordfence plugin installed.


Can you try after deactivating all your security plugin? The possible reason is the security policy(either via some plugin or hosting) blocking access to admin-ajax.php from the front end, also check your https and http settings in general settings :)

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