CyberPanel follows deny all rules except for the ports opened by default, you can see default opened ports at: Server > Security > Firewall
Add Firewall Rule
As I've mentioned above, CyberPanel follows deny all rules, so if you want to allow any port you can add from Server > Security > Firewall.
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Give this rule a name.
Select protocol from dropdown either tcp or udp.
Enter which port to open for specified protocol.
This will add rule and reload firewall.
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Delete Firewall Rule
Just click on the cross on right side of the rule, this will delete the rule and reload firewall.