Unable to locally verify the issuer's authority


Please fill out the fields below so we can help you better.

My domain is:mail.juggernaut.ursolutions.ph
I ran this command: wget https://xmpp.juggernaut.ursolutions.ph
It produced this output: ERROR: cannot verify xmpp.juggernaut.ursolutions.ph’s certificate, issued by ‘/C=US/O=Let’s Encrypt/CN=Let’s Encrypt Authority X3’:
Unable to locally verify the issuer’s authority.
My operating system is (include version): CentOS 7
My web server is (include version): Zimbra 8.7
My hosting provider, if applicable, is:
I can login to a root shell on my machine (yes or no, or I don’t know): yes
I’m using a control panel to manage my site (no, or provide the name and version of the control panel): no

We are doing a PoC of Zimbra Talk, this requires two separate nodes. The Mail server is a Zimbra server on a CentOS machine, and the Talk server is on Ubuntu 14

I installed the LE cert on the Talk server, and a StartSSL cert on the Zimbra as I was having issues implementing LE on the Zimbra server.

Zimbra Support asked us to initiate the wget command above. Further reading says that I have to install intermediate certificates on the Zimbra side? How do I install it if I am using a StartSSL cert?


You’ll have to serve the certificate chain: either use and cert.pem and chain.pem, or use fullchain.pem as the certificate. This depends on the software used.


Judging by the description in


You should use fullchain.pem with this software, if you have chosen cert.pem you will need to update the Zimbra configuration to replace cert.pem with fullchain.pem


This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.