I cannot go to http://novathon.cloud.reply.eu/wp-admin – always redirected to /wp-login

Check if the redirect URL is the same as the login one. Sometimes, if the domain doesn’t have www and you had navigated before to that url, the browser remembers the old url.

http://novathon.cloud.reply.eu/wp-login.php?redirect_to=http%3A%2F%2Fwww.novathon.cloud.reply.eu%2Fwp-admin%2F&reauth=1

Both Urls must be the same.