Usually, this error is caused by:
- Using an account with limited permissions (please try to use an account with full administrator permissions);
- Incorrectly disabled Windows Firewall.
In some cases, the following may help:
1. Run the attached "Windows8LoopbackManager.exe" utility;
2. Check and then uncheck any checkbox, press "Save" button. If you see the empty list in this tool, highly likely your account has limited permissions.