This question has been asked before but I see only D7 versions of the question, and none of their answers have helped me in D8.
I log in perfectly fine with Chrome or Firefox, but IE 11 redirects to the /user/1 page (or /user/2, or whoever you're logging in as) and states 'Access Denied.' If you enter incorrect credentials it states "unrecognized user/pass," but if you enter correct ones it just does the redirect and nothing happens. This is on a fresh install of D8 RC2 and what's worse is I can do a fresh install of D8 RC2 on a different server and IE 11 login works fine. It's something about my server that's causing this. I thought it might be cleanURLs but mod-rewrite is on for both servers.
D7 solutions seem to say, check settings.php and the cookie_domain or base_url variables, but those don't seem to be a part of Drupal 8.
I have cleared IE's cache/cookies about a thousand times.