This has been going on for sometime now
user@host:~$ sudo apt-get update
Ign http://mirror.whonix.de wheezy Release.gpg
Hit http://security.debian.org wheezy/updates Release.gpg
Hit http://deb.torproject.org wheezy Release.gpg
Hit http://ftp.us.debian.org wheezy Release.gpg
Ign http://mirror.whonix.de wheezy Release
Hit http://security.debian.org wheezy/updates Release
Hit http://deb.torproject.org wheezy Release
Hit http://ftp.us.debian.org wheezy Release
Ign http://mirror.whonix.de wheezy/main i386 Packages/DiffIndex
Hit http://security.debian.org wheezy/updates/main i386 Packages
Hit http://deb.torproject.org wheezy/main i386 Packages
Hit http://ftp.us.debian.org wheezy/main i386 Packages
Hit http://security.debian.org wheezy/updates/contrib i386 Packages
Hit http://ftp.us.debian.org wheezy/contrib i386 Packages
Hit http://security.debian.org wheezy/updates/non-free i386 Packages
Hit http://ftp.us.debian.org wheezy/non-free i386 Packages
Hit http://security.debian.org wheezy/updates/contrib Translation-en
Hit http://ftp.us.debian.org wheezy/contrib Translation-en
Hit http://security.debian.org wheezy/updates/main Translation-en
Hit http://ftp.us.debian.org wheezy/main Translation-en
Hit http://security.debian.org wheezy/updates/non-free Translation-en
Hit http://ftp.us.debian.org wheezy/non-free Translation-en
Ign http://deb.torproject.org wheezy/main Translation-en_US
Ign http://deb.torproject.org wheezy/main Translation-en
Ign http://mirror.whonix.de wheezy/main Translation-en_US
Ign http://mirror.whonix.de wheezy/main Translation-en
Err http://mirror.whonix.de wheezy/main i386 Packages
404 Not Found
W: Failed to fetch http://mirror.whonix.de/whonixdevelopermetafiles/internal/dists/wheezy/main/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
user@host:~$
I want to make sure I pass the sanity tests before upgrading.