title: Key Vault - Firewalls and virtual networks: Existing virtual network is not authorized
body: <p>I configured the key vault to sign JWTs from my application and I limited the access to a specific virtual network and related subnet. At the beginning was working fine but suddenly it stopped working giving me the following error:</p>
  
  <pre><code>{"error":{"code":"Forbidden","message":"Client address (52.166.11.176) is not authorized and caller is not a trusted service","innererror":{"code":"ForbiddenByFirewall"}}}
  </code></pre>
  
  <p>I had to allow all the networks to fix the problem.</p>
  
  <p>Do you have any idea about this behaviour?</p>
  
  <p>Thank you</p>
  
  <p>Mario</p>