CRM Portal Font Awesome Icons are not showing up in IE 11

CRM Portal Font Awesome Icons are not showing up in IE 11

Added font awesome as web resource and referred as below in the CSS, but this is not showing the icons in IE rest all browsers shows the icons. Is there any solution to fix this issue?

@font-face {
font-family: 'Font Awesome'; 
src: url('/new_font_awesome.ttf');
src: url('/new_FontAwesome.otf');
src: url('/new_fontawesome_webfont.eot');
src: url('/new_fontawesome-webfont.svg');
}