xdebug远程断点调试老是报socket连接失败

Question

Log opened at 2018-06-01 08:08:35
I: Connecting to configured address/port: 192.168.6.159:9001.
W: Creating socket for '192.168.6.159:9001', poll success, but error: Operation now in progress (29).
E: Could not connect to client. :-(
Log closed at 2018-06-01 08:08:35

如上面的代码，我在远程调试日志中看到这样的错误。看样子意思应该是服务端的xdebug一直与我本机保持着连接，不然不可能提示进行中。
然而我并不可能一直保持着连接。请大牛指教。