Christian Heimes <> added the comment:

It's a duplicate of #32706. The new cert validation code causes the handshake 
to terminate properly. The old asyncore based test routine is not able to 
handle this correctly when the machine is under heavy load.

resolution:  -> duplicate
stage:  -> resolved
status: open -> closed
superseder:  -> test_check_hostname() of test_ftplib started to fail randomly

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