Python import error "DLL load failed" | Python

Question

I'm serving a Django app behind IIS6 web server.

The test server runs perfectly, but when running behind the web server a module failes to import I get this error:

Error loading pyodbc module: DLL load failed: The specified module could not be found

Just for the record the module is pyodbc

The site is served though isapi by using isapi-wsgi

Any ideas? It would really make my day! :)

I have no answer only that after spending a huge amount of time both googling and trying myself I had to give up on using IIS. However, it's running fine using apache instead. — PhoebeB
– PhoebeB, Commented Nov 1, 2010 at 14:11
I have the same issue: ImportError: DLL load failed: The specified procedure could not be found. when import pyodbc on a Windows 10 machine. I am new with windows - how do I check the dependencies with dependencywalker ? — NoIdeaHowToFixThis
– NoIdeaHowToFixThis, Commented Jun 1, 2017 at 12:30

David Cournapeau · Accepted Answer · 2011-01-22 13:03:50Z

4

This error is a PITA: it is often caused by missing symbols in dll (because a dependent dll was not found, etc...). You should check the .pyd with dependency walker, or look into the windows log which may log such errors depending on your configuration.

answered Jan 22, 2011 at 13:03

David Cournapeau

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cethegeek Over a year ago

That helped a lot. For me the missing DLLs were: MSVCR90.DLL, IESHIMS.DLL, WER.DLL.

ayaz · Accepted Answer · 2011-04-08 17:29:30Z

1

I have recently been battling with setting up Django/Python on IIS 7 on Windows 2008 with MS SQL 2008. I bumped into the same problem as you did. I was using PyODBC-2.1.8. I compiled the modules from source. I used the mingw compiler to compile them from source. Nothing worked.

I then downgraded to PyODBC-2.1.7. And it worked! I used the binary available from the site for the Python 2.6 distribution (that is the version of Python I am using).

I hope this may help.

answered Apr 8, 2011 at 17:29

ayaz

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James Bradbury · Accepted Answer · 2015-04-13 16:00:19Z

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In my case I had installed pyodbc for 64-bits on a 32-bit OS. Both versions are available here.

I'm hoping I'm not the only one stupid enough to do this and this might help someone.

answered Apr 13, 2015 at 16:00

James Bradbury

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Milad Hatami · Accepted Answer · 2020-01-13 10:58:19Z

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dowload the latest "Microsoft Visual C++ Redistributable for Visual Studio 2015, 2017 and 2019" from the links at

https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads

answered Jan 13, 2020 at 10:58

Milad Hatami

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