Every time that you log into Proxmox, you get a warning. “You do not have a valid subscription for this server.” I know that I am unable to pay for a subscription, so this is how I removed that message.
I do not recommend using the browser console for this, as I have not had good luck.
Start by using a program such as Putty to SSH into your Proxmox server. Your login credentials will be “root” and the password you used during setup.
Once you have SSH into the server, you are going to want to run the following command.
deb http://ftp.debian.org/debian bookworm main contrib
deb http://ftp.debian.org/debian bookworm-updates main contrib
# Proxmox VE pve-no-subscription repository provided by proxmox.com,
# NOT recommended for production use
deb http://download.proxmox.com/debian/pve bookworm pve-no-subscription
# security updates
deb http://security.debian.org/debian-security bookworm-security main contrib
File Number: 3
nano /etc/apt/sources.list.d/ceph.list
deb http://download.proxmox.com/debian/ceph-reef bookworm no-subscription
At this point, you should be able to run a reboot command, and your Proxmox server should no longer inform that “You do not have a valid subscription for this server.”