Trying to set up Let`s Encrypt on Raspberry Pi web server but got an error asking for me to add MX Record

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My domain is:squackley.ddns.net

I ran this command: sudo certbot --apache certonly

It produced this output: Saving debug log to /var/log/letsencrypt/letsencrypt.log
Starting new HTTPS connection (1): acme-v01.api.letsencrypt.org
No names were found in your configuration files. Please enter in your domain
name(s) (comma and/or space separated) (Enter ‘c’ to cancel):squackley.ddns.net
Obtaining a new certificate
Performing the following challenges:
tls-sni-01 challenge for squackley.ddns.net
Enabled Apache socache_shmcb module
Enabled Apache ssl module
Waiting for verification…
Cleaning up challenges
Failed authorization procedure. squackley.ddns.net (tls-sni-01): urn:acme:error:connection :: The server could not connect to the client to verify the domain :: Failed to connect to 71.201.51.141:443 for tls-sni-01 challenge

IMPORTANT NOTES:

  • The following errors were reported by the server:

    Domain: squackley.ddns.net
    Type: connection
    Detail: Failed to connect to 71.201.51.141:443 for tls-sni-01
    challenge

    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): apache version unknown on raspberry pi

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

My hosting provider, if applicable, is: no-ip.org

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

Where do you see that this is asking for an MX record? It’s saying that it can’t connect to your IP address on port 443. This most likely means that you’re on a residential Internet connection for which the ISP is blocking port 443.

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