title: How do I remove a CLOSE_WAIT socket connection?
body: <p>I have write a simple program using socket in C that create a connect between X86 running windows and ARM running embedded linux(consist of only Busybox and libc).Suddenly this small program could not connect the windows and linux,then I running "netsta -a" found 3 socket's state is <code>CLOSE_WAIT</code> and PID is NULL.So I try to modify “<code>net.ipv4.tcp_keepalive_×</code>” but because busybox has only the basic functions that I could not using <code>/etc/rc.d/init.d/network restart</code> makes the modify  take effect.</p>
  
  <p>So I want to know:</p>
  
  <ol>
  <li>how to make the change take effect with Busybox?</li>
  <li>how I using socket can avoid the <code>CLOSE_WAIT</code> problem?</li>
  </ol>