Can't block port in firewall

I have default Hestiacp installation ( except changed ssh port). I had an app running on port 9999 , so I created new rule in firewall to allow this port.
Since then I reverse proxy that app through nginx. When I deleted that rule, the port is still open. I tried creating new rule to block connections to 9999, but it is still open. What should I do to block this port?

I recommend to manually check your iptables settings from command line. Depending on what you already tried you want to make sure the default policy is still DROP and hasn’t somehow changed…

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Thanks. I will do that. I have no experience with Iptables.