When putting fonts on a server to host them and use them somewhere else (eg. a cdn subdomain) they won't be loaded without the right Access-Control-Allow-Origin header.

To set that you can use the following lines in ether a .htaccess file for Apache or the nginx config:

# Apache config
<FilesMatch ".(eot|ttf|otf|woff)">
	Header set Access-Control-Allow-Origin "*"
</FilesMatch>

# nginx config
if ($filename ~* ^.*?\.(eot)|(ttf)|(woff)$){
	add_header Access-Control-Allow-Origin *;
}

Test if they can be loaded with the following console command:

$ curl -I https://cdn.yourdomain.com/media/fonts/somefont.ttf

Which should give a result like the following:

# Result
HTTP/1.1 200 OK
Server: Apache
X-Backend-Server: developer1.webapp.scl3.mozilla.com
Content-Type: text/plain; charset=UTF-8
Access-Control-Allow-Origin: *
ETag: "4dece1737ba40"
Last-Modified: Mon, 10 Jun 2013 15:04:01 GMT
X-Cache-Info: caching
Cache-Control: max-age=604795
Expires: Wed, 19 Jun 2013 16:22:58 GMT
Date: Wed, 12 Jun 2013 16:23:03 GMT
Connection: keep-alive