If you are getting 404 error (not found) for fontawesome-webfont.woff2?v=4.6.3 but you are definitely sure that it is there in your Visual Studio Project
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>
This code tells the web server to serve the .woff2 file with the correct MIME type, which should resolve the issue.
If this step doesn't resolve the issue, you may need to check your website's file permissions or server configuration to ensure that the Font Awesome files are being served correctly.
I hope this helps