Http-01 challenge failed (cennection refused)

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1

My domain is:

kt368.ddns.info

I ran this command:

certbot-auto renew --dry-run

It produced this output:

   Domain: kt368.ddns.info
   Type:   connection
   Detail: Fetching
   http://kt368.ddns.info/.well-known/acme-challenge/MF0vCk2mxLOe8ZVWoJArWO5wXGnqiE0xSqlb7sNCb3A:
   Connection refused

My web server is (include version):
nginx/1.14.1

The operating system my web server runs on is (include version):
Centos 8

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

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you’re using Certbot):
certbot 1.0.0

2

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