In this talk, I will discuss the history of attacks against one of the most widely used protocol --- TCP. As side channels were never really considered a threat when network protocols are designed, they suffer almost an endless stream of problems. I will demonstrate a blind off-path attacker can use side channels to hijack a remote TCP connection. Recently, we show two serious attacks: (1) a completely blind off-path attacker (not MITM) can hijack a TCP connection between any two arbitrary hosts (i.e., inferring the existence of connection, and sequence numbers). (2) a variation of the attack which exploits a fundamental design of Wi-Fi which is unfortunately impossible to patch in the short term. I will also give insights on how to systematically discover such problems.