Started yesterday. All sites hosted by Netlify via IPv6 are just hanging. Not sure where the problem might lie, if it's the tunnel service or one of netlify's upstreams. They did have a seemingly unrelated upstream routing problem today, so I wouldn't be surprised if it's at their end.
$ curl -6 -vvv -D - https://docs.projectcalico.org/v3.18/manifests/calico.yaml
* Trying 2604:a880:2:d0::2082:a001:443...
* Connected to docs.projectcalico.org (2604:a880:2:d0::2082:a001) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
* CAfile: /etc/ssl/certs/ca-certificates.crt
* CApath: none
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* OpenSSL SSL_connect: Connection reset by peer in connection to docs.projectcalico.org:443
* Closing connection 0
curl: (35) OpenSSL SSL_connect: Connection reset by peer in connection to docs.projectcalico.org:443
Or MTU? What does a traceroute6 yield? No problem here from my end.
Sorry, wrong category and I've isolated the problem to my unifi router.