WinError 10048: Only one usage of each socket address is normally permitted

[jake-the-bird]

I'm trying to use imexam in Jupyter notebook on Windows 10, and on trying to connect to ginga I get a strange socket error:

OSError                                   Traceback (most recent call last)
<ipython-input-2-8bfff7002bf2> in <module>
      2 #os.environ['XPA_METHOD'] = "inet"
      3 
----> 4 viewer = imexam.connect(viewer='ginga')
      5 viewer.load_fits('example_data/PAL5_3p6um.fits')

~\anaconda3\lib\site-packages\imexam\connect.py in __init__(self, target, path, viewer, wait_time, quit_window, port)
     98 
     99         elif 'ginga' in self._viewer:
--> 100             self.window = ginga(exam=self.exam,
    101                                 close_on_del=quit_window,
    102                                 port=port)

~\anaconda3\lib\site-packages\imexam\ginga_viewer.py in __init__(self, exam, close_on_del, logger, port, host, use_opencv)
    926         self._port = port
    927 
--> 928         super(ginga, self).__init__(exam=exam, close_on_del=close_on_del,
    929                                     logger=logger, port=self._port)
    930 

~\anaconda3\lib\site-packages\imexam\ginga_viewer.py in __init__(self, exam, close_on_del, logger, port)
    143 
    144         # create the viewer specific to this backend
--> 145         self._create_viewer(bind_prefs, viewer_prefs)
    146 
    147         # TODO: at some point, it might be better to simply add a custom

~\anaconda3\lib\site-packages\imexam\ginga_viewer.py in _create_viewer(self, bind_prefs, viewer_prefs, opencv, threads)
    950         self._threads = threads
    951         self._server = None
--> 952         self._start_server()
    953 
    954         self.ginga_view = self._server.get_viewer('Imexam Display')

~\anaconda3\lib\site-packages\imexam\ginga_viewer.py in _start_server(self)
    997             no_ioloop = True  # jupyter console and notebook
    998 
--> 999         self._server.start(no_ioloop=no_ioloop)
   1000 
   1001     def _shutdown(self):

~\anaconda3\lib\site-packages\ginga\web\pgw\ipg.py in start(self, use_thread, no_ioloop)
    423         ], factory=self.factory, logger=self.logger)
    424 
--> 425         self.http_server = self.server.listen(self.port, self.host)
    426 
    427         if no_ioloop:

~\anaconda3\lib\site-packages\tornado\web.py in listen(self, port, address, **kwargs)
   2114         """
   2115         server = HTTPServer(self, **kwargs)
-> 2116         server.listen(port, address)
   2117         return server
   2118 

~\anaconda3\lib\site-packages\tornado\tcpserver.py in listen(self, port, address)
    149         the `.IOLoop`.
    150         """
--> 151         sockets = bind_sockets(port, address=address)
    152         self.add_sockets(sockets)
    153 

~\anaconda3\lib\site-packages\tornado\netutil.py in bind_sockets(port, address, family, backlog, flags, reuse_port)
    172 
    173         sock.setblocking(False)
--> 174         sock.bind(sockaddr)
    175         bound_port = sock.getsockname()[1]
    176         sock.listen(backlog)

OSError: [WinError 10048] Only one usage of each socket address (protocol/network address/port) is normally permitted

This is the code I'm trying to run:

viewer = imexam.connect(viewer='ginga')
viewer.load_fits('example_data/PAL5_3p6um.fits')

I've verified that both imexam and ginga are up to date, and I've tried the common problem fixes listed in the documentation, but no dice. Another user also on Windows 10 posted a similar-looking issue a couple of years ago (#151); could this be a Windows 10 specific issue? Thanks!

[jake-the-bird]

Apologies, I hadn't seen the 'port' option in connect() as given in the readme, which fixed my issue in the end. I don't think this is mentioned anywhere on the readthedocs though, maybe it could be useful to mention it on there too?

[sosey]

no worries -the best bug report is the one someone figures out the solution to themselves! I'm glad it's working for you. I'll definitely look through the docs and make sure things like this are easy to find -the docs are in need of another overhaul anyways.

many thanks!