Access EC2 instance via ipv6

Question

My AWS ec2 instance is accessible via ipv4, but I want to replace it by ipv6. I followed the instructions under https://4sysops.com/archives/assign-an-ipv6-address-to-an-ec2-instance-dual-stack/ to configure ipv6, but it is not working: via ping6 , it says the network is not accessible, same when I enter [] in the browser. When I open the ipv4 address in the browser, it works. Any idea why I can't access the instance via ipv6?

My configuration on AWS:

CIDR associated to VPC:
![Enter image description here](/media/postImages/original/IM0c4vZq8xRbSPxE1K2C75-Q)
![Enter image description here](/media/postImages/original/IMGMgbqUZjSCi_ApwF4hXIEQ)

CIDR is also associated to subnet:
![Enter image description here](/media/postImages/original/IMzwQ2JMtTTT2P7Wxw9EhLpA)

Routing table of VPC:
![Enter image description here](/media/postImages/original/IMf6edIW0FS6iwvcK5PUen2A)

Inbound security rules:
![Enter image description here](/media/postImages/original/IM_0D7be2KTXOjPAOYLJIJ9Q)

Instance has an ipv6:
![Enter image description here](/media/postImages/original/IMYbRdeek9SPKTEIzPRM7M8A)

On the instance itself, there is a nginx server which redirects requests to a shiny webserver (https://posit.co/download/shiny-server/). The nginx configuration looks like this:
![Enter image description here](/media/postImages/original/IMIQX6xg9jRXGWBjDsoXIAAw)

Accepted Answer

Hello.

Do you have Nginx configured to listen to IPv6?  
https://nginx.org/en/docs/http/ngx_http_core_module.html#listen

For example, if you add "listen [::]:80;" as shown below, port 80 will be able to listen on IPv6.  
```
server {
    listen [::]:80;
    listen 80;
    server_name example.com;
    # example setting
}
```
Also, does the ISP you use support IPv6?  
If your ISP does not support IPv6, you will not be able to access it even if you have attached IPv6 on EC2.

Access EC2 instance via ipv6

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