[Mashiro]

I searched the forum and found a tutorial about iptables configurations.I found a guide about its configuration.
https://post4vps.com/thread-2643.html

In that thread i started the steps to secure firewall.Unfortunately on step two when i input the command

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iptables -P OUTPUT ACCEPT

My SSH connections lost, i tried reconnecting but failed to connect.Then i restarted the VPS from control panel and re-connected but did not tried running that command again.

Have you paid attention to the explanation of the commands that was under the commands?

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Incoming traffic is blocked by default unless allowed through additional rules. --> Incoming = INPUT --> iptables -P INPUT DROP
Forward traffic is blocked by default unless allowed through additional rules. --> Forward = FORWARD --> iptables -P FORWARD DROP
Outgoing traffic is allowed by default unless blocked through additional rules. --> Outgoing = OUTPUT --> iptables -P OUTPUT ACCEPT

That means you have executed the command when directly connected via SSH. That's a bad idea if you understand what "blocking traffic" means and have read the explanation for the commands.

As soon as you run "iptables -P INPUT DROP" all incoming traffic is instantly dropped. This cuts all connections including SSH instantly. Be careful!


It would have been better if you would have ran these commands through a VNC or emergency console that is provided by the control panel of your VPS or a script that runs all the commands and therefore unlocks traffic to port 22 and etc.