This section shows issues regarding the Proxmox firewall feature.
On rare occasions, due to changes in the network interface or other reasons, the firewall service may get stuck. In such cases, we can restart the service using the following command:
# systemctl restart pve-firewall
If the previous command does not help, then check the syslog of the node to look for a clue. If nothing helps, then a reboot will clear any firewall issues. As of Proxmox VE 5.0, if a firewall becomes inactive, it does not fall back on a predefined set of protection; a firewall simply becomes nonexistent.
This issue may occur when the firewall is not enabled in the virtual network interface of the VM. For each VM, a firewall needs to be enabled in two different places. The first one is under the...