I`m working on a project in ASP.NET MVC 4 and I did following steps:
Downloaded twitter bootstrap from http://blog.getbootstrap.com/2013/12/05/bootstrap-3-
I had the same problem, using IIS 7.5 webserver.
The solution was to add .woff to the list of file name extensions with MIME type application/octet-stream on the webserver.
You could also achieve the same in web.config: