If you see this error:
Connection failed (Error 500: close (rename) atomic file ‘/var/log/pve/tasks/active’ failed: No such file or directory)
when you go to the >_Shell on Proxmox after the the upgrade from ProxmoxVE 6.3-3 to 6.3-4. that mean your host file is not corect.
Here is the fix fot this error:
Edit /etc/hosts file with nano or vim:
add to hosts localhost
After this you will need to (re)generate the SSH key and known hosts with the command pvecm.
(re)generate node files merge authorized SSH keys and known hosts