Failed authorization procedure _ Please help

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1

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My domain is: my.example.com

I ran this command: ./letsencrypt-auto --apache -d my.example.com

It produced this output:
root@VM-MEngine:/opt/letsencrypt# ./letsencrypt-auto --apache -d my.example.com
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Obtaining a new certificate
Performing the following challenges:
tls-sni-01 challenge for my.example.com
Enabled Apache socache_shmcb module
Enabled Apache ssl module
Waiting for verification…
Cleaning up challenges
Failed authorization procedure. my.example.com (tls-sni-01): urn:acme:error:connection :: The server could not connect to the client to verify the domain :: Timeout

IMPORTANT NOTES:

  • The following errors were reported by the server:

    Domain: my.example.com
    Type: connection
    Detail: Timeout

    To fix these errors, please make sure that your domain name was
    entered correctly and the DNS A/AAAA 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): apache2

The operating system my web server runs on is (include version): Ubuntu 14.04.5

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

2

Do you have port 443 open in your firewall or properly opened/port mapped in case of a NAT router?

3

443 port was not open. After opening the port, issue got resolved.

Thanks a lot for your help Osiris.

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