My website cannot be connected to by IPv6 clients

What is the name of the domain?

What is the error number?

None

What is the issue you’re encountering

connect to 2606:4700:3033::ac43:db2d port 443 from :: port 50807 failed: Timed out

What steps have you taken to resolve the issue?

I tried to get help from Discord, unfortunately no solution was found but some info may be helpful there: Discord.

I have tried accessing from my PC (South East Asia) and two EC2 instances in Virginia, none can access. My client from another country in East Asia also cannot access it but he cannot even resolve the domain:

C:\Users\admin>curl -6
https://aitoolsworkspace.com/
-vvv
* Could not resolve host: aitoolsworkspace.com
* shutting down connection #0
curl: (6) Could not resolve host: aitoolsworkspace.com

As for me, I am using Cloudflare DNS (1.1.1.1) and I can resolve it but if I try pinging the IP, I cannot. Everything works fine with IPv4.

What are the steps to reproduce the issue?

Run:

curl -6 https://aitoolsworkspace.com/ -vvv

That thread mentions Viettel in Vietnam, … but what AS number?

The AS number can be found here:

I see a mix of both “Vietel” (single-t) and “Viettel” (double-t) networks, and when alone considering the “Viettel” (double-t) networks, I see these two:

  1. AS7552 Viettel Group
  2. AS24086 Viettel Corporation.

Both of those are able to make a traceroute to the DNS resolver at 2606:4700:4700::1111, - however, none of them are successfully tracing to 2606:4700:3033::ac43:db2d.

Traces to 2606:4700:3033::ac43:db2d end immediately, either by not giving any results at all, or by ending after the second hop (e.g. within Viettel, likely at a Viettel gateway).

As a result of that, (and assuming one of the above networks are correct for where you see the issue), I will therefore suggest you to contact Viettel for further assistance.

That said, -

One guess, which comes to my mind, is that, you’re maybe collateral damage to problems caused by Viettel, such as e.g.:

1 Like

Thanks for the response.

AS Name Cloudflare
AS Number 13335

However I doubt this is an ISP issue because as mentioned in my post, my US EC2 instance and my client in Hongkong have this issue as well.

From one of my EC2 instances: Amazon.com, Inc. (AS14618)

Anything I can go on from here please?

That could sound like you have some sort of WARP / Zero Trust running?

I will suggest you to turn off every kind of VPN, as well as VPN-like stuff (e.g. WARP / Zero Trust), and then try again, when they are all turned off.

From AS14618 in Ashburn, Virginia, US, the IPv6 address 2606:4700:3033::ac43:db2d is also reachable.

Can you get the AS number from your client as well?

Hi, thank you it’s indeed my mistake. My EC2 instance did NOT have IPv6 capacity. I assigned an IPv6 and now it can connect to the site. My client ISP also didn’t provide him with an IPv6, that’s why. Seem like it’s an actual block from my ISP, I will contact them. Thank you very much and sorry for the trouble.