I’ve tried three different browsers. IE10, Chrome and Firefox and on all the three Cookies are enabled but still getting same issue.
I’m able to open Admin Login page but after that when I enter username and password, it does not throw and error but it return same admin login page with blank fields.
Earlier it was working on same system but one day Windows 8 Crashed and after reinstallation of Windows this issue started. I also have similar feeling that there is something in OS or Browser configuration which is preventing the login page to work.