IPv6 connectivity issues with nginx

Hi, I recently turned on IPv6 addresses on one of our droplets hosted in Bangalore. I added a new AAAA entry for this IPv6 address, in addition to the A entry. I now have 2 entries (addresses are obscured here): A Record: @ 139.59.XX.YY 600 seconds AAAA record: @ 2400:6180:100:WW::XXX:YYYY 1 Hour

While I am able to load the website on my browser using https (or http which gets redirected to https), I get a webserver unreachable when I test IPv6 connectivity using http://ipv6-test.com/validate.php

Here are some commands I ran on the server to debug the issue, but I couldn’t find anything wrong:

sudo netstat -tulpan | grep nginx tcp 0 0 0.0.0.0:443 0.0.0.0:* LISTEN 2705/nginx -g daemo tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 2705/nginx -g daemo tcp6 0 0 :::443 :::* LISTEN 2705/nginx -g daemo tcp6 0 0 :::80 :::* LISTEN 2705/nginx -g daemo

ufw status Status: inactive

sudo sysctl -a | grep bindv6only (I explicitly set this to 1 ) net.ipv6.bindv6only = 1 sysctl: reading key “net.ipv6.conf.all.stable_secret” sysctl: reading key “net.ipv6.conf.default.stable_secret” sysctl: reading key “net.ipv6.conf.eth0.stable_secret” sysctl: reading key “net.ipv6.conf.eth1.stable_secret” sysctl: reading key “net.ipv6.conf.lo.stable_secret” sysctl: reading key “net.ipv6.conf.lxdbr0.stable_secret”

This is my nginx config (/etc/nginx/sites-enabled/default)

server { listen 80; listen [::]:80 ipv6only=on; server_name example.com www.example.com; rewrite ^(.*) https://example.com$1 permanent; }

server { listen 443 ssl; listen [::]:443 ipv6only=on; server_name example.com;

ssl_certificate example.com.pem; ssl_certificate_key example.com.key;

: : : }

Am I missing something here?

Best, Roshan