title: C# gRPC client - name resolution failure
body: <p>A client is running our C# gRPC client on a corporate network, behind an HTTP proxy. The <code>http_proxy</code> environment variable is configured, but nevertheless he sees an error message <code>Name resolution failure</code> when attempting to connect to the server on the internet. </p>
  
  <p>DNS resolution from the same machine works fine using nslookup. </p>
  
  <p>Any ideas what I can do to investigate this problem?</p>