Monday, September 23, 2013
The sign-in method you're trying to use isn't allowed. For more info, contact your network administrator
Above problem occur when you have not added a group (of which User try to login) in your local policy login. To resolve the issue, follow the steps,
http://www.sharepointviking.com/the-signin-method-youre-trying-to-use-isnt-allowed-windows-server-2012/Kindly note that above content is originally copied from
In case if above solution resolve your problem then please comment on it to increase its credibility.