Certbot: Some challenges have failed
Diagnose and fix 'Some challenges have failed' when Certbot cannot complete ACME HTTP-01 or DNS-01 domain validation.
Certbot displays "Some challenges have failed" when Let's Encrypt cannot verify domain ownership through the ACME HTTP-01 or DNS-01 challenge.
When Certbot Produces This Error
Certbot displays this error after attempting the ACME challenge and receiving a failure response from Let's Encrypt. The error message includes details about which domain failed and the specific challenge type.
What Causes "Some challenges have failed" in Certbot
Let's Encrypt cannot reach port 80 on the server during an HTTP-01 challenge. A firewall ( UFW, cloud security group, or ISP) is blocking inbound TCP port 80. The Nginxor Apacheweb server is not running or not configured to serve the challenge path.
The domain's DNS A record does not point to the server's public IP address. Let's Encrypt resolves the domain and connects to that IP — if it points elsewhere, the challenge fails.
How to Fix "Some challenges have failed" in Certbot
- Verify port 80 is open and reachable from the internet:
sudo ufw allow 80/tcp
curl -I http://example.com- Verify the DNS A record points to the correct IP:
dig example.com A +short- Verify the web server is running and serving the domain:
sudo systemctl status nginx- Retry the certificate issuance:
sudo certbot --nginx -d example.comRelated Certbot Errors
Certbot: Connection refused during ACME challenge— a specific variant where the connection is actively refused.