v2.15.1 - Impossible to get a new cert

[AceDenghar]

Checklist

• Have you pulled and found the error with jc21/nginx-proxy-manager:latest docker image?
  • Yes
• Are you sure you're not using someone else's docker image?
  • Yes
• Have you searched for similar issues (both open and closed)?
  • Yes

Describe the bug
When i try to get a new cert it fails with an "internal error" message.

In letsencrypt.log :

2026-06-03 17:03:37,186:DEBUG:certbot._internal.log:Exiting abnormally:
Traceback (most recent call last):
File "/opt/certbot/bin/certbot", line 6, in
sys.exit(main())
~~~~^^
File "/opt/certbot/lib/python3.13/site-packages/certbot/main.py", line 18, in main
return internal_main.main(cli_args)
~~~~~~~~~~~~~~~~~~^^^^^^^^^^
File "/opt/certbot/lib/python3.13/site-packages/certbot/_internal/main.py", line 1886, in main
return config.func(config, plugins)
~~~~~~~~~~~^^^^^^^^^^^^^^^^^
File "/opt/certbot/lib/python3.13/site-packages/certbot/_internal/main.py", line 1598, in certonly
lineage = _get_and_save_cert(le_client, config, sans, certname, lineage)
File "/opt/certbot/lib/python3.13/site-packages/certbot/_internal/main.py", line 143, in _get_and_save_cert
lineage = le_client.obtain_and_enroll_certificate(sans, certname)
File "/opt/certbot/lib/python3.13/site-packages/certbot/_internal/client.py", line 533, in obtain_and_enroll_certificate
cert, chain, key, _ = self.obtain_certificate(sans)
~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
File "/opt/certbot/lib/python3.13/site-packages/certbot/_internal/client.py", line 434, in obtain_certificate
orderr = self._get_order_and_authorizations(csr.data, self.config.allow_subset_of_names)
File "/opt/certbot/lib/python3.13/site-packages/certbot/_internal/client.py", line 512, in _get_order_and_authorizations
authzr = self.auth_handler.handle_authorizations(orderr, self.config, best_effort)
File "/opt/certbot/lib/python3.13/site-packages/certbot/_internal/auth_handler.py", line 104, in handle_authorizations
self._poll_authorizations(authzrs, max_retries, max_time_mins, best_effort)
~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/certbot/lib/python3.13/site-packages/certbot/_internal/auth_handler.py", line 208, in _poll_authorizations
raise errors.AuthorizationError('Some challenges have failed.')
certbot.errors.AuthorizationError: Some challenges have failed.

Nginx Proxy Manager Version
v2.15.1

I pruned docker's image and pulled it again to be sure current was not corrupted

To Reproduce
Steps to reproduce the behavior:

1. Create a new host
2. Ask for a new cert
3. Tells an internal error occured

Operating System
Docker container under ubuntu server

[AceDenghar]

Sorry, duplicate of #5606

Didn't saw it... Sorry

[AceDenghar]

I reopened because I think it's finally different.

My apologies if not 🙄

By the way, thanks for what you make possible 👍

(And sorry for my English)

Ace.

[geephile]

Check if your certbot/acme are downgraded. If they are at version 3.3.0 (or if they are not 5.6.0) then its possible the same issue with different logs.
ifso upgrade certbot/acme to version 5.6.0 (or newer) to possibly restore functionality.
And search for the cause of the downgrade.... :)

[AceDenghar]

Thank you vert much for taking time to answer.

I'll try to check.

I'm using NPM via docker... Have you any tips about how to proceed to do that?

Thanks again 👍

[AceDenghar]

Ok I got it :

[root@docker-nginxProxyManager_SRV:/app]# certbot --version
certbot 5.6.0

[AceDenghar]

I'm using your docker image.

Before creating this issue I pruned and repulled it to be sure using it for sure. So it's a "fresh" one

[sbkg0002]

Is there a way to downgrade certbot in the container? My docker install uses certbot 5.6.0, which has the same issue.

EDIT:
Downgraded to various version (3.3.1, 5.1.0); all same issue.
Exec in the container, run

pip3 install --upgrade certbot==5.1.0