https://bugs.winehq.org/show_bug.cgi?id=51950
--- Comment #4 from Ken Sharp imwellcushtymelike@gmail.com --- Though I should add that iperf doesn't hang until I try to close it (CTRL+C), and then it remains in the background running around 2% CPU. If I don't do that then the server component, at least, continues to work as per Comment #1.