root@proxmox:~# apt-get update
Err:1 https://enterprise.proxmox.com/debian/pve bullseye InRelease                                                     
  401  Unauthorized [IP: 2607:5300:203:7dc2::162 443]
Err:2 http://deb.debian.org/debian bullseye InRelease                                                                   
  Could not connect to debian.map.fastlydns.net:80 (2a04:4e42:7b::644). - connect (113: No route to host) Could not connect to debian.map.fastlydns.net:80 (146.75.46.132), connection timed out Unable to connect to deb.debian.org:http:
Err:3 http://deb.debian.org/debian bullseye-updates InRelease                                                           
  Unable to connect to deb.debian.org:http:
Hit:4 http://security.debian.org/debian-security bullseye-security InRelease   
Err:5 http://download.proxmox.com/debian/pve bullseye InRelease               
  Could not connect to download.proxmox.com:80 (2607:5300:203:7dc2::162). - connect (113: No route to host) Could not connect to download.proxmox.com:80 (144.217.225.162), connection timed out
Reading package lists... Done                           
E: Failed to fetch https://enterprise.proxmox.com/debian/pve/dists/bullseye/InRelease  401  Unauthorized [IP: 2607:5300:203:7dc2::162 443]
E: The repository 'https://enterprise.proxmox.com/debian/pve bullseye InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.