Install lets encrypt certificate for a dynamic dns site now running a self signed certificate

My domain

I ran this command: ```
certbot --apache -d -d

It produced this output:
Timeout during connecting (likely firewall problem)
My web server is (include version):apache2 2.4.25

The operating system my web server runs on is (include version):debian 9

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

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you’re using Certbot):0.28.0

The server is reachable via https with a self signed certificate

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It is, but the Let’s Encrypt HTTP-01 validation process ironically needs to make an HTTP request to port 80, which seems to time out.

If you have a firewall blocking port 80, would it be possible to unblock it? Does your ISP block it?

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