admin-ajax.php 403 error

  • I have an ajax login on a client’s site that was working fine until now.
    After the upgrade to 4.8.3 on some machines the ajax login call started to return a 403 error, while for others it continued working perfectly.

    Now after emptying cache files I haven’t been able to reproduce the error on any machine for the last hour, but it is still kind of unnerving.
    On machines that misbehaved, /wp-admin/admin-ajax.php still returned 0 when called directly.

    Anyone had similar issues? Any ideas what might have caused this?

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