Forums mIRC Help SYN Flood Attack Detect

Apparently everytime I try to connect to mIRC. On my router it shows that there is 4 SYN Flood Attacks.

Oct/11/2007 18:02:25 SYN Flood Attack Detect Packet Dropped
Oct/11/2007 18:02:22 SYN Flood Attack Detect Packet Dropped
Oct/11/2007 18:02:19 SYN Flood Attack Detect Packet Dropped
Oct/11/2007 18:02:16 SYN Flood Attack Detect Packet Dropped

How can this be stopped?