Kportscan 30 Upd Portable Link

Attackers might use it to bypass userland monitoring agents that hook sendto / recvfrom syscalls.

TCP requires a three-way handshake ( SYN , SYN-ACK , ACK ). If you send a TCP SYN packet to a closed port, you receive an immediate RST (reset) packet. This gives a clear, fast answer. kportscan 30 upd