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My domain is: 0xaa55.org
It produced this output:
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Starting new HTTPS connection (1): acme-v01.api.letsencrypt.org
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for www.0xaa55.org
http-01 challenge for 0xaa55.org
Using the webroot path /var/www/0xaa55.org for all unmatched domains.
Waiting for verification…
Cleaning up challenges
Failed authorization procedure. www.0xaa55.org (http-01): urn:acme:error:connection :: The server could not connect to the client to verify the domain :: Fetching http://www.0xaa55.org/.well-known/acme-challenge/DpedMpDmE5C600z3M2aAxsMROcTqiQThlij0fBcHB5U: Timeout
My web server is (include version): Lighttpd 1.4.45
The operating system my web server runs on is (include version): Gentoo
My hosting provider, if applicable, is: not applicable
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
Certbot complains that the server could not connect to the client. Connection timeout is given as reason. I’ve checked from a client machine that the web server is accessible on port 80 and also that the directory /.well-known/acme-challenges/ is accessible. When dumping traffic on the server, I see a TCP handshake on port 80 initiated by a Letsencrypt machine, immediately followed by a TCP FIN (connection closing). Can anyone help?