The fab company I work for, Rock Solid Knowledge, are European support partners for IdentityServer (the OpenID Connect and OAuth Framework for .NET).

My front-end guru colleague Karl Tynan designed this error page for, a website we built for official IdentityServer products and services.

(Don't worry, your computer is fine!)

It has since been replaced with something a little less scary:

IdentityServer 404 Page

 Error Type  Link  Found By
Page not Found (404) IdentityServer 404 Karl Tynan