Python Tornado package error when running server -


we running tornado tcp server on windows server 2012 machine. machine handles both http-based dashboard , 21 tcp websocket connected clients. in logs see following error. seems @ low level of websocket13 protocol. networking standpoint mean? why write buffer not greater or equal 0?

[error] [2017-08-17 11:54:14 am] [tornado.application] exception in callback  <bound method websocketprotocol13.periodic_ping of  <tornado.websocket.websocketprotocol13 object @ 0x01d7ad30>>  traceback (most recent call last):  file "c:\python27\lib\site-packages\tornado\ioloop.py", line 1026, in _run      return self.callback()  file "c:\python27\lib\site-packages\tornado\websocket.py", line 1030, in periodic_ping      self.write_ping(b'')  file "c:\python27\lib\site-packages\tornado\websocket.py", line 790, in write_ping      self._write_frame(true, 0x9, data)  file "c:\python27\lib\site-packages\tornado\websocket.py", line 768, in _write_frame      return self.stream.write(frame)  file "c:\python27\lib\site-packages\tornado\iostream.py", line 406, in write      self._handle_write()  file "c:\python27\lib\site-packages\tornado\iostream.py", line 847, in _handle_write      assert self._write_buffer_size >= 0  assertionerror

any tornado or windows networking expert appreciated.


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