title: Nginx OCSP_basic_verify:signer certificate not found
body: <p>I'm setup OCSP stapling on Nginx and get error</p>
  
  <pre><code>OCSP_basic_verify() failed (SSL: error:27069076:OCSP routines:OCSP_basic_verify:signer certificate not found) while requesting certificate status, responder: ocsp.comodoca.com
  </code></pre>
  
  <p>This is nginx file config</p>
  
  <pre><code>server {
       ssl_certificate /etc/nginx/crtfile.crt;
       ssl_certificate_key /etc/nginx/keyfile.key;
  
       ssl_stapling on;
       ssl_stapling_verify on;
       ssl_trusted_certificate /etc/nginx/crttrusted.crt;
       resolver 8.8.8.8 8.8.4.4 valid=300s;
       resolver_timeout 15s;
  }
  </code></pre>
  
  <p>Please suggest a specific solution.</p>