title: Let's Encrypt unauthorized 403 forbidden
body: <p>On the server, Nginx is installed.
  Let's Encrypt is working well with www.domain.com but is not working with  static.domain.com</p>
  
  <p>With PuTTY, when I enter :
  <code>sudo letsencrypt certonly -a webroot --webroot-path=/var/www/site/domain -d static.domain.com -d domain.com -d www.domain.com</code></p>
  
  <p>I have the below issue : </p>
  
  <pre><code>Failed authorization procedure. static.domain.com (http-01): urn:acme:error:unauthorized :: The client lacks sufficient authorization :: Invalid response from http://static.domain.com/.well-known/acme-challenge/c6zngeBwPq42KLXT2ovW-bVPOQ0OHuJ7Fw_FbfL8XfY: "&lt;html&gt;
  &lt;head&gt;&lt;title&gt;403 Forbidden&lt;/title&gt;&lt;/head&gt;
  &lt;body bgcolor="white"&gt;
  &lt;center&gt;&lt;h1&gt;403 Forbidden&lt;/h1&gt;&lt;/center&gt;
  &lt;hr&gt;&lt;center&gt;"
  
  IMPORTANT NOTES:
   - The following errors were reported by the server:
  
     Domain: static.domain.com
     Type:   unauthorized
     Detail: Invalid response from
     http://static.domain.com/.well-known/acme-challenge/c6zngeBwPq42KLXT2ovW-bVPOQ0OHuJ7Fw_FbfL8XfY:
     "&lt;html&gt;
     &lt;head&gt;&lt;title&gt;403 Forbidden&lt;/title&gt;&lt;/head&gt;
     &lt;body bgcolor="white"&gt;
     &lt;center&gt;&lt;h1&gt;403 Forbidden&lt;/h1&gt;&lt;/center&gt;
     &lt;hr&gt;&lt;center&gt;"
  
     To fix these errors, please make sure that your domain name was
     entered correctly and the DNS A record(s) for that domain
     contain(s) the right IP address.
  </code></pre>
  
  <p>Somebody know what can be the issue?</p>