The Certificate Authority failed to download the challenge files from the temporary standalone webserver

My domain is:

I ran this command: sudo certbot certonly -v --dry-run --standalone --preferred-challenges http -d

It produced this output:

My web server is (include version): OpenVPN 2.11.3

The operating system my web server runs on is (include version): Ubuntu 22.04

I can login to a root shell on my machine (yes or no, or I don't know): Yes

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot): certbot 1.21.0

Hello @glukye :slight_smile:

I suggest testing your domain name with Open Port Check Tool - Test Port Forwarding on Your Router to verify Port 80 is Open. Might want --debug-challenges to assist User Guide — Certbot 2.5.0 documentation


I don't see any significant open ports either.

22/tcp  filtered ssh
80/tcp  filtered http
443/tcp filtered https

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