Hours ago, some Reddit users began to report that https://www.openttd.org was offline, while other users reported that it was online. For me, it works via IPv4 but not via IPv6.

Version of OpenTTD

Expected result

https://www.openttd.org should be online.

Actual result

I have both IPv4 and IPv6 service.

• DuckDuckGo for Android: "Webpage not available" "net:;ERR_CONNECTION_RESET"
• DuckDuckGo for iOS: "DuckDuckGo can't load this page." "An SSL error has occurred and a secure connection to the server cannot be made."
• Firefox for Android: "Secure Connection Failed" "The page you are trying to view cannot be shown because the authenticity of the received data could not be verified."
• Firefox for iOS: "The network connection was lost." "NSURLErrorDomain"
• Firefox for OpenBSD: Site is online. OpenBSD resolv.conf(5) says, "By default IPv4 addresses are queried first, and then IPv6 addresses."
• Samsung Internet for Android: "This site can't be reached" "net::ERR_CONNECTION_RESET"

I used OpenBSD ftp(1) -4 and -6 to test the connection; -4 works and -6 fails:

$ ftp -4o /dev/null https://www.openttd.org
Trying 178.128.142.182...
Requesting https://www.openttd.org
100% |**************************************************| 11732       00:00
11732 bytes received in 0.00 seconds (9.34 MB/s)
$ ftp -6o /dev/null https://www.openttd.org 
Trying 2a03:b0c0:2:d0::dc6:7001...
Requesting https://www.openttd.org
ftp: SSL write error: handshake failed: Connection reset by peer

Steps to reproduce

Visit https://www.openttd.org with an internet connection with IPv6 service, and a browser that prefers IPv6 over IPv4.