ERR_TOO_MANY_REDIRECTS

All right, we might’ve narrowed it down to a server configuration thing, so far had success with a new pluggable core function for rewrites.

But first, let’s try the simple solution!

Are you using any kind of services such as CloudFlare or similar for your sites? If so, please try disabling these to make sure they aren’t causing any complications

If the above fails, you can try the below solution.

Please add the following code to the end of your themes functions.php file, a plugin or whatever you feel comfortable with:

if ( ! function_exists( 'wp_redirect' ) ) :
function wp_redirect($location, $status = 302) {
    global $is_IIS;

    /**
     * Filter the redirect location.
     *
     * @since 2.1.0
     *
     * @param string $location The path to redirect to.
     * @param int    $status   Status code to use.
     */
    $location = apply_filters( 'wp_redirect', $location, $status );

    /**
     * Filter the redirect status code.
     *
     * @since 2.3.0
     *
     * @param int    $status   Status code to use.
     * @param string $location The path to redirect to.
     */
    $status = apply_filters( 'wp_redirect_status', $status, $location );

    if ( ! $location )
        return false;

    $location = wp_sanitize_redirect($location);

    header("Location: $location", true, $status);

    return true;
}
endif;

This is essentially the same function core uses, but we’ve removed a call to status_header() from it.

I’m not guaranteeing this is it, but tested sites are as mentioned showing this as functional.

@kylegap

It affects front page redirects ?

These are the rules mentioned for the wp-admin returning a 403/404 so I’d like to know if they are related in any way.

@mike-hickcox
As we try to cover the issue if something is way unrelated to the topic at hand we may at times moderate them to help keep the topic sane and on track and not create confusion, that appears to have happened in this case

@kylegap
But not for the front page redirect loop which is what we are trying to nip in the butt here? 🙂

I’ve not heard if anyone tried the potential fix mentioned in https://wordpress.org/support/topic/err_too_many_redirects-12/page/2?replies=35&view=all#post-7857847 though, would love to know if anyone who was experiencing the problems tried the solution and it fixed things for them? (if not it’s back to the drawing board, but we’re kind of in limbo awaiting feedback to make sure we don’t hunt ghosts after finding a solution, unfortunately I’ve been unable to reproduce the problem so checking what is causing it heavily relies on affected users feedback)