You are looking at the documentation for the 1.3 version of the Apache HTTP Server, which is no longer maintained, and has been declared "end of life". If you are in fact still using the 1.3 version, please consider upgrading. The current version of the server is 2.2.
In addition, make sure that USE_FCNTL_SERIALIZE_ACCEPT is defined (if not defined by Apache autoconfiguration). To reduce instances of connections in FIN_WAIT_2 state, you may also want to define NO_LINGCLOSE (Apache 1.2 only).
NOTE: Unixware 2.1.2 and later already have patch ptf3123 included
In addition, make sure that USE_FCNTL_SERIALIZE_ACCEPT is defined (if not defined by Apache autoconfiguration). To reduce instances of connections in FIN_WAIT_2 state, you may also want to define NO_LINGCLOSE (Apache 1.2 only).
Thanks to Joe Doupnik <JRD@cc.usu.edu> and Rich Vaughn <rvaughn@aad.com> for additional info for UnixWare builds.