How to flush your server's firewall and IP tables

How to flush your server's firewall and IP tables

All servers use IP tables to decide what can access the server and how. If you are blocked from a certain service you can normally gain access by logging in as root and running a command to clear the IP tables. This code is: 

To flush a Single Chain

To flush a specific chain, which will delete all of the rules in the chain, you may use the -F, or the equivalent --flush, option and the name of the chain to flush.

For example, to delete all of the rules in the INPUT chain, run this command:

  • sudo iptables -F INPUT

To flush All Chains

To flush all chains, which will delete all of the firewall rules, you may use the -F, or the equivalent --flush, option by itself:

  • sudo iptables -F

If you already added a Firewall program like CSF you would want to use the CSF command to flush the block which is: 

  • csf -f
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