Please I need your help!!!
I am trying to install LetsEncrypt certificate on my zimbra server (8.7.0) which is installed on ubuntu 14.04. My domain name is uam.edu.ne. I have been strugling on this for several weeks now but in vain.
After downloading the certificate I cd to Letsencript directory and typed the command below:
./letsencrypt-auto certonly --standalone
When the command executed it returned the following output:
Failed authorization procedure. uam.edu.ne (tls-sni-01): urn:acme:error:connection :: The server could not connect to the client to verify the domain :: DNS problem: SERVFAIL looking up A for uam.edu.ne
The following errors were reported by the server:
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. Additionally, please check that
your computer has a publicly routable IP address and that no
firewalls are preventing the server from communicating with the
client. If you’re using the webroot plugin, you should also verify
that you are serving files from the webroot path you provided.
Please help me.
thank you in advance