Seems to be an issue with the web interface for at least some clients:
> curl -v https://lists.opensuse.org
* Trying [2001:67c:2178:8::16]:443...
* Trying 195.135.221.140:443...
* Connected to lists.opensuse.org (2001:67c:2178:8::16) port 443 (#0)
* ALPN: offers h2,http/1.1
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_128_GCM_SHA256
* ALPN: server accepted h2
* Server certificate:
* subject: CN=opensuse.org
* start date: Jan 9 00:43:02 2023 GMT
* expire date: Apr 9 00:43:01 2023 GMT
* subjectAltName: host "lists.opensuse.org" matched cert's "*.opensuse.org"
* issuer: C=US; O=Let's Encrypt; CN=R3
* SSL certificate verify ok.
* using HTTP/2
* h2h3 [:method: GET]
* h2h3 [:path: /]
* h2h3 [:scheme: https]
* h2h3 [:authority: lists.opensuse.org]
* h2h3 [user-agent: curl/7.88.1]
* h2h3 [accept: */*]
* Using Stream ID: 1 (easy handle 0x55f021e90340)
> GET / HTTP/2
> Host: lists.opensuse.org
> user-agent: curl/7.88.1
> accept: */*
>
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* old SSL session ID is stale, removing
(no further response)