Hello, I just can't get it to work, it always fails. When certbot is requesting the certificate I checked if the token url is reachable from the outside and it is: Summary - kc.glu.nl - urlscan.io This site contains no links. | urlscan.io - Website scanner for suspicious and malicious…

[image] mroberti: The firewall is an Palo Alto with deep packet inspection, so I can see a lot of information. Palo Alto firewalls seem to be a recurring issue. See: [image] Renewal failure: "Connection reset by peer" Help Y…

Are you sure it's reachable from everywhere? I tried a different tool and it's showing a failure to connect from some parts of the world. Check website performance and response : Check host - online website monitoring Website checking for speed and availability with servers around the …

Thank you for your reply, Strange, is the url Welcome to nginx! also not reachable from some locations? There shouldn't be any region block and I'm not seeing any blocked traffic to the IP/URL. Can you give an example ip from where it failed? Or a tool that failed? The firewall is an Palo Alto wit…

Thank you Dan, I added the acme-protocol as an allowed application and now it works. It's still strange that it didn't show up as 'blocked' or 'drop', just as port 80, web-browsing, allowed. It's now showing as port 80, acme-protocol, allowed. Again, thanks for the help. It was driving me crazy …

[image] mroberti: strange It is--when we've seen those issues before, I remember seeing "connection reset by peer" rather than "timeout after connect." But good that has it working.

Can't get Letsencrypt/Certbot to work

Help

danb35 January 29, 2026, 1:16pm 4

Palo Alto firewalls seem to be a recurring issue. See:

Topic		Replies	Views
Cerbot --nginx : Timeout during connect Help	4	570	June 22, 2023
Certbot --nginx not working Help	2	457	August 27, 2023
Certbot failed to authenticate some domains (authenticator: nginx) Timeout during connect (likely firewall problem) Help	11	2691	October 7, 2023
Could not issue certificate using certbot, authorization error Help	6	672	October 13, 2022
Error on issuing certificate Help	1	117	December 15, 2025

Can't get Letsencrypt/Certbot to work

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