This section shows issues regarding the Proxmox firewall feature.
Solution: On rare occasions, owing 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:
# service pve-firewall restart
If the previous command does not help, then check the syslog of the node to see if there are any clues. If nothing helps, then a reboot will clear any firewall issues. As with Proxmox VE 4.1, if a firewall becomes inactive, it does not fall back on a predefined set of protection. A firewall simply becomes nonexistent.