Did your WordPress Website Auto Update to 4.4.1 and you have a wp-admin Loop or Re Direct Issue?
Ask your Hosting Provider to disable ModSecurity Rules #214620 & #214940.
This worked for me.If you do not have access to disable the Rules yourself you can test this by disabling ModSecurity completely (temporarily and not really recommended).If your Login redirect or loop issue is gone, then that is the Issue. Enable ModSecurity again and ask your Hosting Provider to just dis able those two Rules.