Failed to load resource admin-ajax.php

Question

I'm still new to WordPress. I have been encountering Failed to load resource: the server responded with a status of 404 (Not Found) error and its pointing it in wp-admin/admin-ajax.php. I have check the folder and admin-ajax.php is there. I also tried calling admin-ajax.php using network_admin_url() instead of admin_url(). But I still keeps on having that error. Is there anyway to solve it? Thank you very much for your help.

Here is the sample code

var ajaxurl = '<?php echo admin_url('admin-ajax.php'); ?>';
  $.ajax({
    type: "POST",
    url: ajaxurl,
    cache: false,
    data: { action: 'getInfo' },
    success: function(data) {
      mIDs= mDisplay(data);
    }
  }).done(function( msg ) {

  });

Answer 1

I contact the hosting provider regarding it. They advise me to fix the .htaccess which causing the error.

Answer 2

finally the problem was that the hosting provider had blocked the admin-ajax.php file saying that this file was receiving too many request, and requests to this file bypasses cache , hence it was causing problems on server :)

Answer 3

I assume you're writing javascript with in php file.

var ajaxurl = '<?php echo admin_url('admin-ajax.php'); ?>'; You're going to save the return value in ajaxurl variable, so you shouldn't echo it.

For external js files, you have to use wp_localize_script to pass ajaxurl to js file

Answer 4

Check if your host has ModSecurity enabled, disable it and give it a try.

worked for me