title: Wordpress admin-ajax.php works on localhost but not server
body: <p>I'm using ajax to filter custom post types in WordPress. On my localhost (xampp) everything works fine and runs well, filters and displays the appropriate posts. </p>
  
  <p>Thus far I've rebuilt the whole site to verify my core files are in tact. I checked the database to make sure my wp-options home and sit urls were set correctly. I've tried it both in http and https as well as resaved the permalinks.</p>
  
  <p>I have also contacted my hosting provider (inMotion) to verify there is nothing I need to do to enable ajax on WordPress. I also have another site running on the same server, that utilizes ajax without issue.</p>
  
  <p>Essentially, what could be causes the "$home_url/wp-admin/admin-ajax.php?grade-filter=&amp;department-filter=+&amp;search=&amp;action=coursefilter"</p>
  
  <p>to throw a GET 400 error?</p>