The present application is directed towards systems and methods for aggressively probing a client side connection to determine and counteract a malicious window size attack or similar behavior from a malfunctioning client. The solution described herein detects when a connection may be under malicious attach via improper or unusual window size settings. Responsive to the detection, the solution described herein will setup probes that determine whether or not the client is malicious and does so within an aggressive time period to avoid the tying up of processing cycles, transport layer sockets and buffers, and other resources of the sender.