Timeout downloading certificates

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My domain is: cornerstone.ac.za

I ran this command: sudo certbot --webroot -w /var/www/bigbluebutton-default/ -d khuluma.cornerstone.ac.za certonly

It produced this output: Failed authorization procedure. khuluma.cornerstone.ac.za (http-01): urn:ietf:params:acme:error:connection :: The server could not connect to the client to verify the domain :: Fetching http://khuluma.cornerstone.ac.za/.well-known/acme-challenge/tb5nSAKgLb27-zqMIdoyG7HDsOfrtiPj1AiNh0KOw6w: Timeout during connect (likely firewall problem)

My web server is (include version): nginx 1.10.3 (Ubuntu)

The operating system my web server runs on is (include version): Ubuntu 16.04.6

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): 0.31.0

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Hi,

In order to use HTTP-01 validation, your port 80 also need to be open (as it’s where Let’s Encrypt start to connect). Please open your port 80 (and setup port forwarding if needed) before try again.

Thank you

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