title: Failing to renew Let's Encrypt SSL
body: <p>I easily installed an SSL certificate the first time through, but I am unable to get it to renew.</p>
  
  <p>I scheduled the terminal command to automatically renew the certificate each month, but it is responding with an error. I also get the same response when running it manually.</p>
  
  <p><strong>Terminal Command</strong></p>
  
  <pre><code>curl -X POST https://forge.laravel.com/api/servers/&lt;serverNumber&gt;/sites/&lt;siteNumber&gt;/ssl/renew?api_token=&lt;my-token&gt;
  </code></pre>
  
  <p><strong>Response</strong></p>
  
  <pre><code>Cloning into 'letsencrypt1462928414'...
  nginx stop/waiting
  nginx start/running, process 10734
  # INFO: Using main config file /root/letsencrypt1462928414/config.sh
  + Generating account key...
  + Registering account key with letsencrypt...
  Processing donniebrandt.com with alternative names: www.donniebrandt.com
   + Signing domains...
   + Creating new directory /root/letsencrypt1462928414/certs/donniebrandt.com ...
   + Generating private key...
   + Generating signing request...
   + Requesting challenge for donniebrandt.com...
   + Requesting challenge for www.donniebrandt.com...
   + Responding to challenge for donniebrandt.com...
  ERROR: Challenge is invalid! (returned: invalid) (result: {"type":"http-01","status":"invalid","error":{"type":"urn:acme:error:unauthorized","detail":"Invalid response from http://donniebrandt.com/.well-known/acme-challenge/JdG5PtzEcqZMMDVhx2VNN5Wmvldwtl84B6q3j1AQcP0 [104.18.50.184]: 526"},"uri":"https://acme-v01.api.letsencrypt.org/acme/challenge/S6oIx5ZFyzu80fkpjoCcAgVDp7p8aLo6UGLLt7flP-g/81801388","token":"JdG5PtzEcqZMMDVhx2VNN5Wmvldwtl84B6q3j1AQcP0","keyAuthorization":"JdG5PtzEcqZMMDVhx2VNN5Wmvldwtl84B6q3j1AQcP0.0N_sDHF2rXqfyPHGi4ZmXDAkrmwbMJ-S_ZghYPtSN2g","validationRecord":[{"url":"http://donniebrandt.com/.well-known/acme-challenge/JdG5PtzEcqZMMDVhx2VNN5Wmvldwtl84B6q3j1AQcP0","hostname":"donniebrandt.com","port":"80","addressesResolved":["104.18.50.184","104.18.51.184"],"addressUsed":"104.18.50.184"},{"url":"https://donniebrandt.com/.well-known/acme-challenge/JdG5PtzEcqZMMDVhx2VNN5Wmvldwtl84B6q3j1AQcP0","hostname":"donniebrandt.com","port":"443","addressesResolved":["104.18.50.184","104.18.51.184"],"addressUsed":"104.18.50.184"}]})
  </code></pre>
  
  <p>I also verified that the <code>.well-known/acme-challenge</code> directory exists, but it doesn't change the error.</p>