Ssl certification

[tamah]

sudo certbot --nginx -d hf20959fw5f.sn.mynetname.net
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Requesting a certificate for hf20959fw5f.sn.mynetname.net

Certbot failed to authenticate some domains (authenticator: nginx). The Certificate Authority reported these problems:
Domain: hf20959fw5f.sn.mynetname.net
Type: dns
Detail: DNS problem: SERVFAIL looking up A for hf20959fw5f.sn.mynetname.net - the domain's nameservers may be malfunctioning; DNS problem: SERVFAIL looking up AAAA for hf20959fw5f.sn.mynetname.net - the domain's nameservers may be malfunctioning

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. See the logfile /var/log/letsencrypt/letsencrypt.log or re-run Certbot with -v for more details.

Please how can I solve this issue ?

[rg305]

Hi @tamah, and welcome to the LE community forum

Outside of the DNS problem...
You won't be able to authenticate via HTTP while using IP 100.126.124.75:
ARIN Whois/RDAP - American Registry for Internet Numbers

You might be able to use DNS authentication.
But that wouldn't get you much; As all Internet users [outside of your ISP] will not be able to reach your domain [via that IP].
[and even the ones within your ISP may not be able to reach you either - can't be 100% sure about them]