Ok thanks. As the rest of Python2.7 is built with VS2008, I will try rebuilding 
with that.

Brian

-----Original Message-----
From: Cryptography-dev 
<cryptography-dev-bounces+brian.matthews=vaisala....@python.org> On Behalf Of 
Paul Kehrer
Sent: January 8, 2021 9:54 AM
To: cryptography-dev@python.org
Subject: Re: [Cryptography-dev] Heap error in _openssl.pyd

We don't have the symbol files, but it was built with VS 2010 (scripts found 
here: 
https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fpyca%2Finfra%2Ftree%2Fmaster%2Fwindows%2Fopenssl&amp;data=04%7C01%7Cbrian.matthews%40vaisala.com%7C9568a9cebccd4386a7ee08d8b3fe6d05%7C6d7393e041f54c2e9b124c2be5da5c57%7C0%7C0%7C637457252632399827%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=G8fvEPiFnlraSXitzLryVi8uwraKL0a2iIgE9efC0Fo%3D&amp;reserved=0)

-Paul

On Fri, Jan 8, 2021 at 11:36 AM Matthews Brian <brian.matth...@vaisala.com> 
wrote:
>
> Hi,
>
>
>
>   We are using pyOpenSSL 20.0.1 with cryptography 3.3.1 in Python 2.7.17 x64. 
> This is running on Microsoft Windows 2019.
>
>
>
> The pyOpenSSL is being used as part of a twisted Web implementation, handling 
> TLS HTTPS communications.
>
>
>
> We are experiencing random crashes in the _openssl.pyd module. On some sites 
> it is once per month, on other sites it is once per day.
>
>
>
> The crash dump shows a HEAP error originating in the _openssl.pyd module 
> during TLS negotiation.
>
>
>
> Has anyone else experienced this
> Are the symbol pdb files available for the _openssl.pyd object What VS 
> studio version are the wheels for 2.7 built with
>
>
>
> Thanks
>
>
>
> Brian.
>
>
>
>
>
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