Yeah, the CN is cdn.media.ccc.de, and SANs on the cert are DNS Name: berlin-ak.cdn.media.ccc.de, berlin-ak.ftp.media.ccc.de, cdn.media.ccc.de, ftp.media.ccc.de, static.media.ccc.de. Unfortunate submission typo! I've done similar a few times.
Maybe @dang or one of the moderators can swap to the link in your edit!
> Firefox does not trust https://ftp.ccc.de/congress/2024/h264-hd/ because its certificate issuer is unknown, the certificate is self-signed, or the server is not sending the correct intermediate certificates.
Edit: https://ftp.media.ccc.de/congress/2024/h264-hd/ is probably what OP meant to share.