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Restart firewall got hangs

Posted: 2017/09/14 10:28:40
by qzaqza15
The flow is as stated below:

After I run the command:

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service iptables restart


The is what it prompt and we can see that flush firewall rules and unloading modules works fine except the last step which is applying firewall rules.

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iptables: Setting chains to policy ACCEPT: nat filter      [  OK  ]
iptables: Flushing firewall rules:                         [  OK  ]
iptables: Unloading modules:                               [  OK  ]
iptables: Applying firewall rules:                         


It keep on hanging for more than one hour and I don't know should I force close it or not. Anyone could give me some advice on how to exit this in proper way or what may be the cause of it?

Re: Restart firewall got hangs

Posted: 2017/09/14 10:53:56
by TrevorH
If you did that via an ssh session then try starting a new ssh session, login and check the state of your rules now. When you restart iptables like that it can interrupt existing connections and one of those would be your ssh connection.

Re: Restart firewall got hangs

Posted: 2017/09/14 10:59:52
by qzaqza15
Thanks for reply
check the state of your rules


I have start a new ssh session but I not sure how to check the state of firewall rules.

This is the command I use to check the state of firewall

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iptables -L -n


And it display firewall rules so it should means the firewall is working.

Re: Restart firewall got hangs

Posted: 2017/09/14 14:53:10
by TrevorH
iptables-save should show them all.

You can't really restart iptables from an ssh connected session as it always has the possibility of stopping the session you're running in. If you want to amend the rules then use the iptables command itself to -A append or -I insert new rules in the correct places.

Re: Restart firewall got hangs

Posted: 2017/09/15 09:29:42
by qzaqza15
Okay, thanks for your help.