--dry-run with no Error but without Errors

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My domain is: 4gjn.com

I ran this command:certbot certonly --standalone -d mx01.4gjn.com -d smtp.4gjn.com -d imap.4gjn.com --dry-run -m postmaster@4gjn.com

certbot certonly --standalone -d mx01.4gjn.com -d smtp.4gjn.com -d imap.4gjn.com -m postmaster@4gjn.com

It produced this output:

  1. IMPORTANT NOTES:
  • The dry run was successful

2.Saving debug log to /var/log/letsencrypt/letsencrypt.log
Starting new HTTPS connection (1): acme-v01.api.letsencrypt.org
Obtaining a new certificate
Performing the following challenges:
tls-sni-01 challenge for mx01.4gjn.com
tls-sni-01 challenge for smtp.4gjn.com
tls-sni-01 challenge for imap.4gjn.com
Waiting for verification…
Cleaning up challenges
Failed authorization procedure. imap.4gjn.com (tls-sni-01): urn:acme:error:connection :: The server could not connect to the client to verify the domain :: Error getting validation data, mx01.4gjn.com (tls-sni-01): urn:acme:error:connection :: The server could not connect to the client to verify the domain :: Error getting validation data, smtp.4gjn.com (tls-sni-01): urn:acme:error:connection :: The server could not connect to the client to verify the domain :: Error getting validation data

IMPORTANT NOTES:

  • The following errors were reported by the server:

    Domain: imap.4gjn.com
    Type: connection
    Detail: Error getting validation data

    Domain: mx01.4gjn.com
    Type: connection
    Detail: Error getting validation data

    Domain: smtp.4gjn.com
    Type: connection
    Detail: Error getting validation data

    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.
    My web server is (include version):

The operating system my web server runs on is (include version):

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):

2

possible issue of concern (IPv6):
Addresses: 2001:470:1f0b:371::203
89.26.108.7

3

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