Unable to renew my certificate

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My domain is: http://uat.component.dolphinchat.ai/

I ran this command: sudo certbot -d uat.component.dolphinchat.ai

It produced this output:

My web server is (include version): Nginx - 1.18.0

The operating system my web server runs on is (include version): ubuntu 20.04

I am trying you renew the certificate which is giving me this error. I have already checked no AAAA address is mapped with IP. Also, port number 80 is open for both ip4 and ip6 requests.

My website is visible and can be accessed publicly.

Not using http it isn't. As the error states, Let's Encrypt are unable to perform the required http validation check. So, even if http works over port 443, you still need to have port 80 open.


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