code: @Friend(ConnectionTcp.class)
    void freeConnection(ConnectionTcp conn)
    {
      if (removeConnection(conn)) {
        _idleConn.free(conn);
      }
      else if (isActive()) {
        // Thread.dumpStack();
        System.out.println("Possible Double Close: " + this + " " + conn);
      }
  
      //_connThreadPool.wake();
    }
docs: Closes the stats for the connection.