What to do if Linux cannot start iptables

Solution: 1. Create a new rule with the syntax "iptables -P..."; 2. Use "service iptables save" to save, and use "ls /etc/sysconfig/" to view the newly created configuration. file; 3. Use "service iptables start" to start iptables.

#The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

What to do if linux cannot start iptables

Problem description:

Enter "service iptables status" to view the status, prompt: iptables: Firewall is not running.

Enter "service iptables start" to start iptables, prompt: iptables: No config file. [WARNING].

Enter "ls /etc/sysconfig/" to view, but the configuration file iptables was not found.

Solution:

1. Create a new rule (in this case, iptables -P OUTPUT ACCEPT).

2. Enter "service iptables save" to save. It will prompt that it has been successfully saved to /etc/sysconfig/iptables.

iptables: Saving firewall rules to /etc/sysconfig/iptables: [   OK    ]

Enter "ls /etc/sysconfig/" again to view the discoverable configuration file (in the blue box in the picture below).

#3. Enter "service iptables start" to start.

Recommended learning: Linux video tutorial

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