Acme servers on ipv6 not respoding on 443 [fixed]


The ipv6 addresses returned from a dns query for “” don’t have anything listening on port 443:

# host is an alias for is an alias for has address has IPv6 address 2a02:26f0:c8:287::3d5 has IPv6 address 2a02:26f0:c8:286::3d5

# ping6 -c 2 2a02:26f0:c8:287::3d5                                  
PING 2a02:26f0:c8:287::3d5(2a02:26f0:c8:287::3d5) 56 data bytes
64 bytes from 2a02:26f0:c8:287::3d5: icmp_seq=1 ttl=57 time=27.3 ms
64 bytes from 2a02:26f0:c8:287::3d5: icmp_seq=2 ttl=57 time=28.2 ms
--- 2a02:26f0:c8:287::3d5 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 27.367/27.784/28.202/0.449 ms

# ping6 -c 2 2a02:26f0:c8:286::3d5                               
PING 2a02:26f0:c8:286::3d5(2a02:26f0:c8:286::3d5) 56 data bytes
64 bytes from 2a02:26f0:c8:286::3d5: icmp_seq=1 ttl=57 time=23.0 ms
64 bytes from 2a02:26f0:c8:286::3d5: icmp_seq=2 ttl=57 time=23.2 ms
--- 2a02:26f0:c8:286::3d5 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1000ms
rtt min/avg/max/mdev = 23.031/23.134/23.237/0.103 ms

but if i try https:

curl -v                       
* About to connect() to port 443 (#0)
*   Trying 2a02:26f0:c8:286::3d5...
* Connection timed out
*   Trying 2a02:26f0:c8:287::3d5...
* Connection timed out
*   Trying
* connected
* Connected to ( port 443 (#0)

It takes about 2 mins to timeout and fall back to v4.

Works perfectly for me through IPv6.

Does your IPv6 work for other sites? Like Facebook/Google?

After pokeing around more it was caused by a firewall issue on our end.

Sorry for the noise.

1 Like

Thanks for replying, Jasper.

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