FontAwesome does not work for me when I put my app on IIS7 server.
In Firefox the requested URL is encoded to http://l2etest.kema.intra/fonts/fontawesome-webfo
http://l2etest.kema.intra/fonts/fontawesome-webfo
If you're adding FontAwesome via bundling, it can throw out the woff2 url. See the following solution on a similar thread where CssRewriteUrlTransform is used to rework the url: https://stackoverflow.com/a/22700610/746984
CssRewriteUrlTransform