Font Awesome error: downloadable font: rejected by sanitizer

Remove the ?v=4.6.3 and remaining tail from this block (font-awesome.css / font-awesome.min.css).

@font-face {
  font-family: 'FontAwesome';
  src: url('../fonts/fontawesome-webfont.eot?v=4.6.3');
  src: url('../fonts/fontawesome-webfont.eot?#iefix&v=4.6.3') format('embedded-opentype'), 
  url('../fonts/fontawesome-webfont.woff2?v=4.6.3') format('woff2'),
  url('../fonts/fontawesome-webfont.woff?v=4.6.3') format('woff'),
  url('../fonts/fontawesome-webfont.ttf?v=4.6.3') format('truetype'), 
  url('../fonts/fontawesome-webfont.svg?v=4.6.3#fontawesomeregular') format('svg');
  font-weight: normal;

Updated to:

@font-face {
  font-family: 'FontAwesome';
  src: url('../fonts/fontawesome-webfont.eot');
  src: url('../fonts/fontawesome-webfont.eot') format('embedded-opentype'), 
  url('../fonts/fontawesome-webfont.woff2') format('woff2'), 
  url('../fonts/fontawesome-webfont.woff') format('woff'), 
  url('../fonts/fontawesome-webfont.ttf') format('truetype'), 
  url('../fonts/fontawesome-webfont.svg') format('svg');
  font-weight: normal;
  font-style: normal;
}

In my case I had a problem with a SVG loader (either vue-svg-loader or nuxt-svg-loader) that ended up converting the font URL into an object resulting in something like this:

@font-face{
    font-family:fontello;
    ...
    src:url([object object]) format("svg");
}

If you are getting the error fontawesome-webfont.woff2?v=4.6.3 not found but you definitely know you have the file, here is how to fix it in IIS:

You need to add the mime type in the config file for woff2.

<system.webServer>
<staticContent>
<remove fileExtension=".woff2" />
<mimeMap fileExtension=".woff2" mimeType="font/woff2" />
</staticContent>
</system.webServer>

Catched !! Solved with replacing

font-family: 'fontawesome-webfont';

instead of

font-family: 'FontAwesome';

I works for me.