sources.list if you have a subscription



:~# aptitude update
Hit http://ftp.de.debian.org wheezy Release.gpg
Hit http://security.debian.org wheezy/updates Release.gpg
Hit http://ftp.de.debian.org wheezy Release
Hit http://security.debian.org wheezy/updates Release
Get: 1 http://download.proxmox.com wheezy Release.gpg [198 B]
Hit http://ftp.de.debian.org wheezy/main amd64 Packages
Hit http://security.debian.org wheezy/updates/main amd64 Packages
Get: 2 http://download.proxmox.com wheezy Release [3,083 B]
Hit http://ftp.de.debian.org wheezy/contrib amd64 Packages
Hit http://security.debian.org wheezy/updates/contrib amd64 Packages
Hit http://ftp.de.debian.org wheezy/contrib Translation-en
Hit http://download.proxmox.com wheezy/pve-no-subscription amd64 Packages
Hit http://security.debian.org wheezy/updates/contrib Translation-en
Hit http://ftp.de.debian.org wheezy/main Translation-en
Hit http://security.debian.org wheezy/updates/main Translation-en
Ign http://download.proxmox.com wheezy/pve-no-subscription Translation-en_US
Ign http://download.proxmox.com wheezy/pve-no-subscription Translation-en
Get: 3 https://enterprise.proxmox.com wheezy Release.gpg [490 B]
Ign https://enterprise.proxmox.com wheezy Release.gpg
Ign https://enterprise.proxmox.com wheezy Release
Err https://enterprise.proxmox.com wheezy/pve-enterprise amd64 Packages
The requested URL returned error: 401
Ign https://enterprise.proxmox.com wheezy/pve-enterprise Translation-en_US
Ign https://enterprise.proxmox.com wheezy/pve-enterprise Translation-en
Fetched 3,281 B in 2s (1,159 B/s)
W: Failed to fetch https://enterprise.proxmox.com/debian/dists/wheezy/pve-enterprise/binary-amd64/Packages: The requested URL returned error: 401
E: Some index files failed to download. They have been ignored, or old ones used instead.
E: Couldn't rebuild package cache

:~# cat /etc/apt/sources.list

deb http://ftp.de.debian.org/debian wheezy main contrib
deb http://download.proxmox.com/debian wheezy pve-no-subscription
deb http://security.debian.org/ wheezy/updates main contrib
deb https://enterprise.proxmox.com/debian wheezy pve-enterprise
 
...
Ign https://enterprise.proxmox.com wheezy Release.gpg
Ign https://enterprise.proxmox.com wheezy Release
Err https://enterprise.proxmox.com wheezy/pve-enterprise amd64 Packages
The requested URL returned error: 401
Ign https://enterprise.proxmox.com wheezy/pve-enterprise Translation-en_US
Ign https://enterprise.proxmox.com wheezy/pve-enterprise Translation-en
Fetched 3,281 B in 2s (1,159 B/s)
W: Failed to fetch https://enterprise.proxmox.com/debian/dists/wheezy/pve-enterprise/binary-amd64/Packages: The requested URL returned error: 401
E: Some index files failed to download. They have been ignored, or old ones used instead.
E: Couldn't rebuild package cache

:~# cat /etc/apt/sources.list

deb http://ftp.de.debian.org/debian wheezy main contrib
deb http://download.proxmox.com/debian wheezy pve-no-subscription
deb http://security.debian.org/ wheezy/updates main contrib
deb https://enterprise.proxmox.com/debian wheezy pve-enterprise

If you do not have a valid subscription to access https://enterprise.proxmox.com , this is expected.