Certbot failed to authenticate some domains (authenticator: nginx)

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Do you have any geo blocking?

As I still see

$ nmap -Pn -p80,443 mentoring.cehrd.gov.np                                                                           Starting Nmap 7.80 ( https://nmap.org ) at 2024-10-22 16:41 UTC
Nmap scan report for mentoring.cehrd.gov.np (103.69.124.47)
Host is up (0.43s latency).

PORT    STATE    SERVICE
80/tcp  filtered http
443/tcp open     https

Nmap done: 1 IP address (1 host up) scanned in 5.80 seconds

Please read these:

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