How to activate firewall on Centos server?

[friv]

Hello folks

I am facing with one problem to activate firewall on my Centos 7 server, VPS

My first step is to check did firewall is active with command sudo systemctl status firewalld and then i see is not active ,after command sudo systemctl enable firewalld firewall is active in green color.

But when i want to check websites i see the error "Host error" and every website is down. Then after disabling firewall websites back again online.

I was contact my hosting company and they do not want to help to activate firewall at my server. They told me that i need to pay 79$ for that. LOL

So, i think that i am in right place for this,because i hope so that somebody will help me. Thanks in advance

[TrevorH]

If you've never run it then it comes up and disallows everything except ssh port 22 traffic. Yuo need to start it and then configure it to allow the right things through. For example, firewall-cmd --add-service=http then run that again with --permanent so that comes back at next reboot/restart. Also may want to --add-service=https as well.

[tmandel]

I would also do a

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sudo firewall-cmd --add-service=ssh --permanent

Then you can go with a

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sudo firewall-cmd --reload

or a

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sudo systemctl restart firewalld