If a system isn’t reachable through WebGUI or SSH after some network/firewall configs the only access method is through the system console. This is is interface that is used to install IPFire.
Using this interface you can try to edit the firewall settings stored in /var/ipfire/firewall/config. There you can find the DNAT rule. Delete it and do /usr/local/bin/firewallctrl restart.
To allocate the irresponsive device you should know the IP. The assignment of IPs to physical devices is known, I suppose.
Thank you very much for your response! Do you have any suggestions on how to resolve the black screen issue via the system console? Pressing the space key did not help. The same monitor works on the other firewall.
If you can boot your machine with a LiveCD, Antix, Ubuntu, etc.
Mount the /dev/sda4 partition and edit the /var/ipfire/firewall/config file as @bbitsch suggested.
(Remove the first ON on the line of the broken rule)
Restart IPFire.
Hi Guys, the issue has been resolved by removing the rule from /var/ipfire/firewall/config and /etc/rc.d/init.d/firewall reload.
I also found this thread:
Gotta be more careful with the rules, im not used to the IPFire yet.
Thanks so much for the help!