Renew problem with certbot renew --dry-run

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My domain is:

I ran this command: sudo certbot renew --dry-run

It produced this output:
Failed to renew certificate with error: HTTPSConnectionPool(host='', port=443): Max retries exceeded with url: /directory (Caused by NewConnectionError('<urllib3.connection.HTTPSConnection object at 0xb2fc1d18>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution'))

My web server is (include version): nginx/1.18.0 (Ubuntu)

The operating system my web server runs on is (include version):
Ubuntu 21.04 (GNU/Linux 5.11.0-1023-raspi armv7l)

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): certbot 1.29.0

Hi @JT69V, and welcome to the LE community forum :slight_smile:

That's a DNS issue.

Please check:
cat /etc/resolv.conf
dig +short
dig +short @


Thanks, it was indeed a DNS problem (unknown problem with systemd-resolved, so I replaced resolv.conf by a static file).

Is there anything else I should do now ?

sudo certbot renew --dry-run
Saving debug log to /var/log/letsencrypt/letsencrypt.log

Processing /etc/letsencrypt/renewal/

Simulating renewal of an existing certificate for

Congratulations, all simulated renewals succeeded:
/etc/letsencrypt/live/ (success)

1 Like

Probably do an actual renewal instead of just the --dry-run :wink:


Yes of course, thanks a lot !