title: The remote certificate is invalid according to the validation procedure using IdentityServer3
body: <p>I am using the ThinkTecture IdentitySever3 in my Web Api project and it has been working fine for the past 2 months in the project I am developing. Suddenly as of today, I am running into this exception when I try to use authentication:</p>
  
  <pre><code>"The remote certificate is invalid according to the validation procedure"
  </code></pre>
  
  <p>The project is using the idsrv3test.pfx that comes as a part of the IdentityServer3 samples.</p>
  
  <p>Any ideas why it would suddenly start to behave like that? And how to fix it of course?</p>