Redirect all login attempts to root login page with mod_rewrite

It depends where you put it in your .htaccess.

If you put the lines BELOW the WP ones, then the WP ones go first. Above, and they go second.

Can you share your .htaccess?

Hm. Well, why not cheat and use a filter? I suspect the problem is that wp-login.php passes params on it’s own, and your borking those.

http://www.joshstauffer.com/wordpress-redirect-users-after-log-in/

// Redirect admins to the dashboard and other users elsewhere
add_filter( 'login_redirect', 'novasource_login_redirect', 10, 3 );
function novasource_login_redirect( $redirect_to, $request, $user ) {
    // Is there a user?
    if ( is_array( $user->roles ) ) {
        // Is it an administrator?
        if ( in_array( 'administrator', $user->roles ) )
            return home_url( '/wp-admin/' );
        else
            // Go to the home URL of the site you're on:
            return home_url();

            // to go to a specific page on the site:
            // return get_permalink( 83 );

            // Go to the network home
            // return network_site_url();

    }
}

See http://codex.wordpress.org/Plugin_API/Filter_Reference/login_redirect 🙂

Yeah, but look at how WP has their redirects. You’d want this:

RewriteRule ^([_0-9a-zA-Z-]+/)?wp-login.php$ wp-login.php$1 [L,NC]

Still, it doesn’t matter where they log in, does it? I mean, once you log in to subsite, you’re logged in for all sites.

Oh bah, humbug, for plugins that aren’t network aware :/

I know . means ‘any’ but again, look at how WP’s default .htaccess handles it. There’s probably a reason they don’t do it that way.

Anyway, there are still other WP tricks like….

function redirect_register() {
  global $blog_id;
  if ($blog_id != 1) {
    wp_redirect( 'http://maindomain.com/wp-login.php' );
    exit();
  }
}
add_action( 'login_form_register', 'redirect_register' );

Replied there.

IMO, you should still use ([_0-9a-zA-Z-]+/)?wp-login.php(.*)$ because that should prevent any front-facing page with ‘wp-login.php’ in the slug from getting redirected too. I admit the odds are astronomical in that happening, but we’ve met weirder users 😉