Request for letsencrypt.org ssl certificate failing

I'm trying to renew my ssl certificate with letsencrypt.org following the instructions here:

https://www.bluefeathergroup.com/blog/filemaker/lets-encrypt-ssl-certificates-for-filemaker-server-for-mac/

When I run the terminal command:

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sudo sh ./GetSSL.sh

I get the follow response (I've replaced my FQDN with "my.domain.com":

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Requesting a certificate for my.domain.com

Certbot failed to authenticate some domains (authenticator: webroot). The Certificate Authority reported these problems:
  Domain: my.domain.com
  Type:   connection
  Detail: Fetching http://my.domain.com/.well-known/acme-challenge/ZeydzsIdVnUXvRG2FU-yGd3gF3S4O9LU5WErD_xoPlM: Timeout during connect (likely firewall problem)

Hint: The Certificate Authority failed to download the temporary challenge files created by Certbot. Ensure that the listed domains serve their content from the provided --webroot-path/-w and that files created there can be downloaded from the internet.

Some challenges have failed.
Ask for help or search for solutions at https://community.letsencrypt.org. See the logfile /var/log/letsencrypt/letsencrypt.log or re-run Certbot with -v for more details.
cp: /etc/letsencrypt/live/my.domain.com/fullchain.pem: No such file or directory
cp: /etc/letsencrypt/live/my.domain.com/privkey.pem: No such file or directory
chmod: /Library/FileMaker Server/CStore/privkey.pem: No such file or directory
mv: /Library/FileMaker Server/CStore/serverKey.pem: No such file or directory
fmsadmin: really delete certificate? (y, n) (Warning: server needs to be restarted) 

 

The response above seems to indicate perhaps I have a firewall issue? I can connect to my filemaker database via my FQDN without issue. However I am having trouble getting to my server admin console via my FQDN:16000/:

Any help is appreciated!