Server could not connect to the client to verify the domain - Zimbra Talk

We are trying to install a trial of Zimbra Talk but apparently LE’s server cannot resolve some of the A records we registered, even though we tried dig-ging the domains it on three different locations.
More info:

Full domain name:, and 7 sub domains: xmpp, conference, external, conference.external, auth, jitsi-videobridge, and focus

Command line ran:./certbot-auto certonly

Output of the command:

OS and webserver: Ubuntu 14.04LTS, certs are to be used for Zimbra Talk

Hosting provider: Linode

for me it’s also failing at your authoritative nameserver ( - ) which doesn’t respond, hence does not provide the A records.

Also your SOA records point to as your primary nameserver.

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