Our hosting company recently upgraded their WAP (Windows Azure Pack) which was not a very smooth upgrade. One of the things that changed was that Microsoft changed the Mime types it maps. This requires that certain mime types are defined in the web.config.

For our particular site this solved the problem:

  <remove fileExtension=".woff" />
  <mimeMap fileExtension=".woff" mimeType="application/x-font-woff" />
  <remove fileExtension=".woff2" />
  <mimeMap fileExtension=".woff2" mimeType="application/font-woff2" />

Hopefully, this will help someone else.

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