This is to document a problem I had with CSF (ConfigServer Firewall) today that cost me a good couple hours.

The problem was that my Ethereum node communicating on port 30303 was being blocked, even though I had added the ports to my config file. It seemed to be working just fine, blocking bad logins and otherwise communications to and from my machine, but when I added new ports to the TCP_IN, TCP_OUT, UDP_IN and UDP_OUT lists and ran sudo systemctl restart csf, they wouldn't take effect.

See answer for solution....


The solution was frustrating: systemctl didn't actually refresh the iptables rules. Only csf -ra would do that. So after several hours of beating my head against the wall, I finally ran csf -ra just for kicks and everything came up.

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