https://ftp.de.debian.org doesn't work anymore

[Andrey Gursky <andrey.gursky@e-mail.ua>]

Hello,

on this Monday I could not update Debian testing anymore, since 
connection to my preferred mirror fails with the following error:

Err:34 https://ftp.de.debian.org/debian buster Release
  SSL: certificate subject name (debian.inf.tu-dresden.de) does not 
match target host name 'ftp.de.debian.org'

Indeed, the server has a new let's encrypt certificate. Should Debian or 
the mirror server fix this?

Thanks,
Andrey


P.S. I'm not on the list, please add me in CC.