Certificates with Let's encrypt (Certbot) and NGINX on Docker installed HA

Configuration
1

Hi All,

I have spend nearly 3 days on getting certificate for domain that I have registered. I have opened port 80 and 443 and can reach the NGINX page from browser using http://domain.com.

When I try to generate the certificate, it gives me below error. I have been through all the documentation on HA and searched on google but none of them works.

Please help !!!

capture
capture726×400 260 KB

Thanks in advance.

PS: please ignore the post. Apologies not able delete it.
RT