If we try to login to Magento Cmmunity Edition - Backend from Windows 8 based workstation, then it does not work at all irrespective of the browser in use.
It look like something is not allowing Windows to access.
We installed Magento on our Hosting Provider Server and after installation went successfully, when we tried to login from Windows 8 - 64 Bit, it doesn\’t work.
Frontend is working fine but Backend login fails to work.
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.
If you change the clock on the hour / two forward on the computer, then let?
Then the problem is solved by extending the life of cookie in admin.
The default setting is 1 hour.
If it is not help for different browsers, then try to understand the reason for exploring class /app/code/core/Mage/Core/Model/Session/Abstract/Varien.php