Linksys Router BEFSR41

Hello,

Ports 80 and 113 are standing on closed how can i stealthed these ports i receive many attacks in the IDS of Kerio Firewall 4.1 there are many denial of dos attacks, trojan attempts, administrator attempts etc, port 80 and 113 are the only ports which standing on closed the rest is stealthed. How do i stealthed port 80 and 113 can i block port 113 in the firewall with an rule in/out denied port 113 i have no shutdown the router and receive at least 90 % less attacks so the router makes problems