I'm currently serving the server using nginx with the following configuration.

server {
    server_name www.skipven.xyz skipven.xyz;

    location = /favicon.ico { access_log off; log_not_found off; }
    location /static/ {
        root /home/ubuntu/ari-bot/aribot;
    }

    location / {
        include proxy_params;
        proxy_pass http://unix:/home/ubuntu/ari-bot/ari-bot.sock;
    }

    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/skipven.xyz/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/skipven.xyz/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
}

server {
    if ($host = www.skipven.xyz) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


    if ($host = skipven.xyz) {
        return 301 https://$host$request_uri;
    } # managed by Certbot

    listen 80;
    server_name www.skipven.xyz skipven.xyz;
    return 404; # managed by Certbot
}

When I try to access http://skipven.xyz, It's successfully redirected to https://skipven.xyz . But https://skipven.xyz doesn't return anything. I also can't find any access log of the https request but http request is logged like charm.

Other things to note:

Running sudo nginx -t return the following response:

nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

Running sudo ufw status return the following response:

Status: active

To                         Action      From
--                         ------      ----
Nginx Full                 ALLOW       Anywhere                  
22/tcp                     ALLOW       Anywhere                  
Nginx Full (v6)            ALLOW       Anywhere (v6)             
22/tcp (v6)                ALLOW       Anywhere (v6)