"TCP sockstress is a potentially serious generic issue in many
operating systems that affects the availability of TCP services.
Jack C. Louis, a security researcher at a Outpost 24, a network
security company based in Karlskrona, Sweden discovered it. The
company's CSO, Robert E. Lee, is the author of Unicornscan, a
formidably fast scanner much loved by penetration testers which,
unlike Nmap, has its own TCP/IP stack and which is capable of
scanning an internal class B network (that's 65,000 + hosts) in
less than three minutes."