# Error on issuing certificate

**URL:** <https://community.letsencrypt.org/t/error-on-issuing-certificate/243862>\
**Category:** Help\
**Created:** [December 15, 2025, 10:47am UTC](https://community.letsencrypt.org/t/error-on-issuing-certificate/243862 "2025-12-15T10:47:25Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![sudip08](https://avatars.discourse-cdn.com/v4/letter/s/7ba0ec/32.png) [@sudip08](https://community.letsencrypt.org/u/sudip08)\
**Post date:** [December 15, 2025, 10:47am UTC](https://community.letsencrypt.org/t/error-on-issuing-certificate/243862/1 "2025-12-15T10:47:25Z")

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I ran this command:  
sudo certbot --nginx -d [fileapi.innovationnxt.com](http://fileapi.innovationnxt.com/)

It produced this output:  
Requesting a certificate for [fileapi.innovationnxt.com](http://fileapi.innovationnxt.com/)

Certbot failed to authenticate some domains (authenticator: nginx). The Certificate Authority reported these problems:  
Domain: [fileapi.innovationnxt.com](http://fileapi.innovationnxt.com/)  
Type: connection  
Detail: 202.51.3.192: Fetching [http://fileapi.innovationnxt.com/.well-known/acme-challenge/CBpf8QsRxF0VS-U-5dghrJlPaMRoMZEzjKU38RicVps:](http://fileapi.innovationnxt.com/.well-known/acme-challenge/CBpf8QsRxF0VS-U-5dghrJlPaMRoMZEzjKU38RicVps:) Timeout during connect (likely firewall problem)

Hint: The Certificate Authority failed to verify the temporary nginx configuration changes made by Certbot. Ensure the listed domains point to this nginx server and that it is accessible from the internet.

Some challenges have failed.  
Ask for help or search for solutions at [https://community.letsencrypt.org](https://community.letsencrypt.org/). See the logfile /var/log/letsencrypt/letsencrypt.log or re-run Certbot with -v for more details.

My web server is (include version):  
linux server  
The operating system my web server runs on is (include version):  
Oracle Linux 8

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**Author:** ![MikeMcQ](https://sea3.discourse-cdn.com/letsencrypt/user_avatar/community.letsencrypt.org/mikemcq/32/52772_2.png) [@MikeMcQ](https://community.letsencrypt.org/u/MikeMcQ)\
**Post date:** [December 15, 2025, 3:14pm UTC](https://community.letsencrypt.org/t/error-on-issuing-certificate/243862/2 "2025-12-15T15:14:00Z")

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> [@sudip08](#):
>
> Detail: 202.51.3.192: Fetching [http://fileapi.innovationnxt.com/.well-known/acme-challenge/CBpf8QsRxF0VS-U-5dghrJlPaMRoMZEzjKU38RicVps:](http://fileapi.innovationnxt.com/.well-known/acme-challenge/CBpf8QsRxF0VS-U-5dghrJlPaMRoMZEzjKU38RicVps:) Timeout during connect (likely firewall problem)

Do you have a firewall blocking certain IP addresses?

Because I can connect to your domain using my own test server. And, using the test site [https://letsdebug.net](https://letsdebug.net)

But, I see connections from the production Let's Encrypt system are timing out. This is almost certainly a firewall of some kind.

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**Author:** ![system](https://global.discourse-cdn.com/letsencrypt/original/3X/c/a/ca6c06ea1ea201324bba7048c6841ce60236468d.png) [@system](https://community.letsencrypt.org/u/system)\
**Post date:** [January 14, 2026, 3:14pm UTC](https://community.letsencrypt.org/t/error-on-issuing-certificate/243862/3 "2026-01-14T15:14:45Z")

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