https://github.com/FortAwesome/Font-Awesome/issues/2193 Url should be /fonts, no...

studiofellow on Oct 24, 2013 | parent | context | favorite | on: Font Awesome 4 released

Url should be /fonts, not /font.

In variables.less, change @fa-font-path to: "//netdna.bootstrapcdn.com/font-awesome/4.0.0/fonts"