LetsEncrypt : Intermediate certificate for LetsEncrypt
<p>We are currently using LetsEncrypt SSL certificates and it's working good. After some modifications we are able to pull it into Tomcat and Apache web server as well. </p>

<p>Currently, we want to add LetsEncrypt certificate to Etherpad, where it demands <code>intermediate CA</code> files. How can I get those out of the 4 certificate files provided by LetsEncrypt. Thank you..</p>

<p>LetsEncrypt SSL settings :</p>

<pre><code> "ssl" : {
            "key"  : "/path-to-your/epl-server.key",
            "cert" : "/path-to-your/epl-server.crt",
            "ca": ["/path-to-your/epl-intermediate-cert1.crt", "/path-to-your/epl-intermediate-cert2.crt"]
          },
</code></pre>

<p>In the above configuration I presume Key is the <code>privkey.pem</code> converted to .key file and .crt is <code>cert.pem</code> converted to cert.crt. What goes in the CA?</p>

<p>Thank you. </p>

<p><em>Update</em></p>

<p>Settings :</p>

<pre><code> "ssl" : {
            "key"  : "/etc/letsencrypt/live/www.project_name.de-0001/private.key",
            "cert" : "/etc/letsencrypt/live/www.project_name.de-0001/cert.crt",
            "ca": "/etc/letsencrypt/live/www.project_name.de-0001/root.crt"
          },
</code></pre>

<p>Error log when trying keys :</p>

<pre><code>[2016-11-04 13:25:15.612] [INFO] console - Report bugs at https://github.com/ether/etherpad-lite/issues
[2016-11-04 13:25:15.612] [INFO] console - Your Etherpad version is 1.6.0 (7dd934f)
[2016-11-04 13:25:15.613] [INFO] console - SSL -- enabled
[2016-11-04 13:25:15.613] [INFO] console - SSL -- server key file: /etc/letsencrypt/live/www.project_name.de-0001/private.key
[2016-11-04 13:25:15.614] [INFO] console - SSL -- Certificate Authority's certificate file: /etc/letsencrypt/live/www.project_name.de-0001/cert.crt
[2016-11-04 13:25:15.615] [ERROR] console - Error: EISDIR: illegal operation on a directory, read
</code></pre>