MikroTik

hi all, i need your help, how i can block manual proxy on mikrotik?
when user type manual proxy on their browser, like this one 163.221.11.71 port 3124, the user will pass the mikrotik block

how i can block that manual proxy ?

thanks

on simple solution that comes into my mind is to make firewall rule that uses address-list of allowed addresses, that can access the proxy.

For that make address-list and add firewall rule in input chain that will accept packets from these addresses, or other way around, make list with addresses to deny and drop them in firewall.