How to block/ban different Host's?

[AlxX0r]

Hi, i maintain some Servers on that runs different services & i want to block/ban out some Host's from Internet, that they don't can connect to my Network.

I have createt a Firewall blocking rule on WAN Interface with the targeted IPv4 as Source that i want to block. As Destination i have setted the WAN Adress & the Port to any or the specified for that i want to block the connection. The Protocol is TCP/UDPv4 or any.

Normally this rule must work & block or reject the connection from the specified Host.
But it don't do this, why?

What's wrong & how it don't want to work?
Can you help me please?

Many Thanks, Greetings