Christian Heimes <li...@cheimes.de> added the comment:

3.7 is in security fix-only mode.

APPLICATION_DATA_AFTER_CLOSE_NOTIFY is a protocol violation in any TLS version. 
It's not related to TLS 1.3. The error occurs when one side wants to close the 
connection, but the other sides keeps sending user data. It's bug in higher 
level application could. The ssl module cannot ignore this error condition.

https://github.com/openssl/openssl/blob/76624df15fef0725f28a8b9d0f31256946669b1a/ssl/record/rec_layer_s3.c#L1635-L1648

----------
assignee:  -> christian.heimes
components: +SSL, asyncio -Extension Modules, Library (Lib)
nosy: +asvetlov, yselivanov
stage: resolved -> 
type:  -> behavior
versions:  -Python 3.7

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39951>
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