Workaround for socket permission errors on Cygwin #4584
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Error on Travis appears to be spurious. |
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Kicking CI. |
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Oh cool, I forgot about this. Thanks for accepting the fix. |
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As reported first here, when running on Cygwin if the notebook server tries to bind on the default port (say 8888) and this results in a permission error for some reason (perhaps a service is installed that as exclusive permission to use that port) the notebook server crashes instead of automatically trying another port.
I confirmed that this is likely due to a bug in Cygwin such that it does not properly map the
WSAEACCESwinsock error code to the POSIXEACCES.This provides a simple workaround--unfortunately the workaround can in principle mask other errors (since the
EPERMset by Cygwin is a default fallback for unrecognized winsock errors), but this is going to be the most likely culprit for users.