Issue you may encounter:
Attempting to log in via WBI
Enter in your known correct username and password, press the OK, but the WBI login returns both login name and password field blank without logging in
Are you using IE10 Internet Explorer 10?
Confirm if you instead bring up your WBI on a different browser and version (such as IE8 or Firefox or Chrome) that you can successfully log in.
If so, that may indicate that your server requires a hotfix KB2600088 for your Microsoft.NET Framework 4
Request the hotfix via http://support.microsoft.com/kb/2600088
Download, apply and don’t forget to reboot!