Seems to happen because of security updates? one example: https://packages.debian.org/stretch/firefox-esr https://metadata.ftp-master.debian.org/changelogs//main/f/firefox-esr/firefox-esr_60.6.0esr-1~deb9u1_changelog >Not Found > >The requested URL >/changelogs/main/f/firefox-esr/firefox-esr_60.6.0esr-1~deb9u1_changelog >was not found on this server. >Apache Server at metadata.ftp-master.debian.org Port 443