Block specific IP from being accessed by LAN clients

[pbnet]

Hello,
I'm trying to block a specific IP (e.g. 104.199.64.36) from being accessed from all LAN IPs (172.17.77.0/24).

I've created a firewall rule with:
Action: Reject
Interface: LAN
Address Family: IPv4
Protocol: Any

Source: Any
Destination: Single Host or Alias: 104.199.64.36

Unfortunately, it does not work, since I can still ping the 104.199.64.36 IP from the LAN machines.

Anyone could give me some help?

Thanks.

[KOM]

@pbnet Established states will not be affected by a rule change. Set your rule, clear your states and try your test again.

[pbnet]

@kom Thanks a lot.
How do I clear the states?

Thanks

[hieroglyph]

@pbnet Please google something like: pfsense clear states

[pbnet]

Thanks everyone.
Worked like a charm.