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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 18.0.2): 20.0.4
Operating system and version (eg, Ubuntu 20.04): Ubuntu 20.04.1 LTS (GNU/Linux 5.4.0-58-generic x86_64)
Apache or nginx version (eg, Apache 2.4.25):
PHP version (eg, 7.1): 7.4.13
The issue you are facing:
HI,
Cannot renew let’s encrypt certificates,
Nextcloud server Server is working fine but when trying to renew let’s encrypt certs if fails with:
Saving debug log to /var/snap/nextcloud/current/certs/certbot/logs/letsencrypt.log
Plugins selected: Authenticator webroot, Installer None
Renewing an existing certificate
Performing the following challenges:
http-01 challenge for remotecloud.duckdns.org
Using the webroot path /var/snap/nextcloud/current/certs/certbot for all unmatched domains.
Waiting for verification…
Challenge failed for domain remotecloud.duckdns.org
http-01 challenge for remotecloud.duckdns.org
Cleaning up challenges
Some challenges have failed.
IMPORTANT NOTES:
-
The following errors were reported by the server:
Domain: remotecloud.duckdns.org
Type: connection
Detail: Fetching
http://remotecloud.duckdns.org/.well-known/acme-challenge/RFZsFeoiGzb1qAXhOo2d0Yurmrb2UQI:
Timeout during connect (likely firewall problem)To fix these errors, please make sure that your domain name was
entered correctly and the DNS A/AAAA record(s) for that domain
contain(s) the right IP address. Additionally, please check that
your computer has a publicly routable IP address and that no
firewalls are preventing the server from communicating with the
client. If you’re using the webroot plugin, you should also verify
that you are serving files from the webroot path you provided.
Checks from check-your-website.server-daten.de are ok:
https://check-your-website.server-daten.de/?q=remotecloud.duckdns.org
Redirection from the outside is ok as well;
It is a Nextcloud in a Docker virtual station in a Qnap NAS, so not really sure how to nginx versions.
NOTE: Random character strings has been edited; let me know if I should share it
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
The output of your Nextcloud log in Admin > Logging:
None. just some Antivirus related entrances ("RuntimeException: The antivirus executable could not be found at /usr/bin/clamscan")
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
PASTE HERE
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE
The output lets encrypt log in /var/snap/nextcloud/current/certs/certbot/logs/letsencrypt.log:
root@nextlouds1:/var/log# less /var/snap/nextcloud/current/certs/certbot/logs/letsencrypt.log
"addressUsed": "87.222.229.172"
}
]
}
]
}
2020-12-29 14:43:41,126:DEBUG:acme.client:Storing nonce: 0004VOT-i153dekMF2GamH08kOY
2020-12-29 14:43:41,128:WARNING:certbot.auth_handler:Challenge failed for domain remotecloud.duckdns.org
2020-12-29 14:43:41,128:INFO:certbot.auth_handler:http-01 challenge for remotecloud.duckdns.org
2020-12-29 14:43:41,129:DEBUG:certbot.reporter:Reporting to user: The following errors were reported by the server:
Domain: remotecloud.duckdns.org
Type: connection
Detail: Fetching http://remotecloud.duckdns.org/.well-known/acme-challenge/OO88sKm0Zmi9AIBoTYtZ2mwI: Timeout during connect (likely firewall problem)
To fix these errors, please make sure that your domain name was entered correctly and the DNS A/AAAA record(s) for that domain contain(s) the right IP address. Additionally, please check that your computer has a publicly routable IP address and that no firewalls are preventing the server from communicating with the client. If you're using the webroot plugin, you should also verify that you are serving files from the webroot path you provided.
2020-12-29 14:43:41,131:DEBUG:certbot.error_handler:Encountered exception:
Traceback (most recent call last):
File "/snap/nextcloud/25276/lib/python2.7/site-packages/certbot/auth_handler.py", line 90, in handle_authorizations
self._poll_authorizations(authzrs, max_retries, best_effort)
File "/snap/nextcloud/25276/lib/python2.7/site-packages/certbot/auth_handler.py", line 154, in _poll_authorizations
raise errors.AuthorizationError('Some challenges have failed.')
AuthorizationError: Some challenges have failed.
2020-12-29 14:43:41,131:DEBUG:certbot.error_handler:Calling registered functions
2020-12-29 14:43:41,132:INFO:certbot.auth_handler:Cleaning up challenges
2020-12-29 14:43:41,132:DEBUG:certbot.plugins.webroot:Removing /var/snap/nextcloud/current/certs/certbot/.well-known/acme-challenge/OO88sKm0Zmi9AIBoTYtZ2mwI
2020-12-29 14:43:41,134:DEBUG:certbot.plugins.webroot:All challenges cleaned up
2020-12-29 14:43:41,135:DEBUG:certbot.log:Exiting abnormally:
Traceback (most recent call last):
File "/snap/nextcloud/25276/bin/certbot", line 8, in <module>
sys.exit(main())
File "/snap/nextcloud/25276/lib/python2.7/site-packages/certbot/main.py", line 1364, in main
return config.func(config, plugins)
File "/snap/nextcloud/25276/lib/python2.7/site-packages/certbot/main.py", line 1249, in certonly
lineage = _get_and_save_cert(le_client, config, domains, certname, lineage)
File "/snap/nextcloud/25276/lib/python2.7/site-packages/certbot/main.py", line 115, in _get_and_save_cert
renewal.renew_cert(config, domains, le_client, lineage)
File "/snap/nextcloud/25276/lib/python2.7/site-packages/certbot/renewal.py", line 308, in renew_cert
new_cert, new_chain, new_key, _ = le_client.obtain_certificate(domains, new_key)
File "/snap/nextcloud/25276/lib/python2.7/site-packages/certbot/client.py", line 349, in obtain_certificate
orderr = self._get_order_and_authorizations(csr.data, self.config.allow_subset_of_names)
File "/snap/nextcloud/25276/lib/python2.7/site-packages/certbot/client.py", line 385, in _get_order_and_authorizations
authzr = self.auth_handler.handle_authorizations(orderr, best_effort)
File "/snap/nextcloud/25276/lib/python2.7/site-packages/certbot/auth_handler.py", line 90, in handle_authorizations
self._poll_authorizations(authzrs, max_retries, best_effort)
File "/snap/nextcloud/25276/lib/python2.7/site-packages/certbot/auth_handler.py", line 154, in _poll_authorizations
raise errors.AuthorizationError('Some challenges have failed.')
AuthorizationError: Some challenges have failed.```
