WordPress Admin Login Redirect Problem

Assuming you have access to the database, run the following query:

SELECT option_value FROM wp_options WHERE option_name="siteurl" OR option_name="home";

^{Replace wp_ with the prefix that is defined for $table_prefix in your wp_config.php if it’s not the default wp_.}

This is just to ensure that your site is going to the expected location and not still the development one. If it isn’t going to the right location, then that would be why your site is going into a redirection loop when you try to log into the admin section.

Change those two keys in the database or alternatively define it in your wp_config.php using:

define('WP_SITEURL', 'http://example.com');
define('WP_HOME', 'http://example.com');