Solved. Install SSL for Proxmox VE 6.3 using Certbot by Let's Encrypt (LE)
I nstall certbot with apt: # apt install certbot Rub the following command and follow the instructions on the screen to obtain the certificate. # certbot certonly Copy the certificate from the Let's Encrypt directory to the PVE directory #cp /etc/letsencrypt/live/proxmox.jnec.edu.bt/fullchain.pem /etc/pve/local/pve-ssl.pem #cp /etc/letsencrypt/live/ proxmox .jnec.edu.bt/privkey.pem /etc/pve/local/pve-ssl.key #systemctl restart pveproxy Cronjob to renew the certificate: Lets Encrypt SSL expire every 90 days, so we will renew it every month with a cronjob. For this, create a file # vim /usr/local/bin/renew-pve-certs.sh with the following code : cp /etc/letsencrypt/live/proxmox.jnec.edu.bt/fullchain.pem /etc/pve/local/pve-ssl.pem cp /etc/letsencrypt/live/proxmox.jnec.edu.bt/privkey.pem /etc/pve/local/pve-ssl.key service pveproxy restart Make it executable : #chmod 755 /usr/local/bin/renew-pve-certs.sh Run this command every 30 days, add the following in the cronjob : #vim /et