Mikrotik - how to block requests from local net to internet through 445 port

Choose NEW TERMINAL in WINBOX

copy and paste this lines

/ip firewall filter

add action=drop chain=forward comment="drop all trafic with destination port 445" \

    dst-port=445 log=yes protocol=tcp

add action=drop chain=forward comment="drop all trafic with destination port 445" \

    dst-port=445 log=yes protocol=udp

!!! After that - you will see new rules in section IP - FIREWALL - Filter RULES  -  Move the new rules to the top position.