Hi!
this looks like a different error, should be fixable by re-generating the certs:
Code:
rm -f /etc/pve/pve-root-ca.pem /etc/pve/priv/pve-root-ca.* /etc/pve/local/pve-ssl.*;
pvecm updatecerts -f;
Also note that the path for the host firewall is
/etc/pve/nodes/{your hostname here}/host.fw
!