A TLS-related traceback shows up during CherryPy startup on Windows 10

❓ I’m submitting a …

• 🐞 bug report
• 🐣 feature request
• ❓ question about the decisions made in the repository

🐞 Describe the bug. What is the current behavior?

When attempting to run cherrypy with SSL I get the error:

ConnectionAbortedError: [WinError 10053]

❓ What is the motivation / use case for changing the behavior?

Need an HTTPS listener

💡 To Reproduce Run the folllowing script:

import cherrypy

class RootServer:
    @cherrypy.expose
    def index(self, **keywords):
        return "it works!"

if __name__ == '__main__':
    server_config={
        'server.socket_host': '127.0.0.1',
        'server.socket_port': 8443,
        'server.ssl_certificate':'cert.pem',
        'server.ssl_private_key':'privkey.pem'
    }

    cherrypy.config.update(server_config)
    cherrypy.quickstart(RootServer())

📋 Details

18/Jul/2020:14:01:24] ENGINE Started monitor thread 'Autoreloader'.
Exception in thread Thread-2:
Traceback (most recent call last):
  File "C:\Users\lameg\AppData\Local\Programs\Python\Python38-32\lib\threading.py", line 932, in _bootstrap_inner
    self.run()
  File "C:\Users\lameg\AppData\Local\Programs\Python\Python38-32\lib\threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Users\lameg\AppData\Local\Programs\Python\Python38-32\lib\site-packages\cheroot\ssl\builtin.py", line 72, in <lambda>
    target=lambda: context.wrap_socket(
  File "C:\Users\lameg\AppData\Local\Programs\Python\Python38-32\lib\ssl.py", line 500, in wrap_socket
    return self.sslsocket_class._create(
  File "C:\Users\lameg\AppData\Local\Programs\Python\Python38-32\lib\ssl.py", line 1040, in _create
    self.do_handshake()
  File "C:\Users\lameg\AppData\Local\Programs\Python\Python38-32\lib\ssl.py", line 1309, in do_handshake
    self._sslobj.do_handshake()
ConnectionAbortedError: [WinError 10053] An established connection was aborted by the software in your host machine
[18/Jul/2020:14:01:24] ENGINE Serving on https://127.0.0.1:8443

📋 Environment

• CherryPy version: 18.6.0
• Python version: 3.8.3rc1
• OS: Windows 10

[Safihre]

@webknjaz I wanted to make an issue a few days ago, but seems I forgot 😨 Python 3.8.3 (tags/v3.8.3:6f8c832, May 13 2020, 22:37:02) [MSC v.1924 64 bit (AMD64)] Here is the cheroot reproducer:

from cheroot import wsgi

def my_crazy_app(environ, start_response):
    status = '200 OK'
    response_headers = [('Content-type', 'text/plain')]
    start_response(status, response_headers)
    return [b'Hello world!']

addr = '0.0.0.0', 8070
server = wsgi.Server(addr, my_crazy_app)

# the SSL stuff:
from cheroot.server import get_ssl_adapter_class
server.ssl_adapter = get_ssl_adapter_class(name='builtin')(r'C:\Users\jiriv\AppData\Local\sabnzbd\admin\server.cert', r'C:\Users\jiriv\AppData\Local\sabnzbd\admin\server.key')
server.start()

Results in:

Traceback (most recent call last):
  File "C:\Users\saf\AppData\Local\Programs\Python\Python38\lib\threading.py", line 932, in _bootstrap_inner
    self.run()
  File "C:\Users\saf\AppData\Local\Programs\Python\Python38\lib\threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Users\saf\Documents\GitHub\sabnzbd3\venv\lib\site-packages\cheroot\ssl\builtin.py", line 68, in <lambda>
    target=lambda: context.wrap_socket(
  File "C:\Users\saf\AppData\Local\Programs\Python\Python38\lib\ssl.py", line 500, in wrap_socket
    return self.sslsocket_class._create(
  File "C:\Users\saf\AppData\Local\Programs\Python\Python38\lib\ssl.py", line 1040, in _create
    self.do_handshake()
  File "C:\Users\saf\AppData\Local\Programs\Python\Python38\lib\ssl.py", line 1309, in do_handshake
    self._sslobj.do_handshake()
ConnectionAbortedError: [WinError 10053] An established connection was aborted by the software in your host machine

[Safihre]

@webknjaz I am seeing the same traceback on Windows with all our SABnzbd clients that have HTTPS enabled. It only started to happen after I updated our dependencies, so I think it has to do with https://github.com/cherrypy/cheroot/pull/291 Do you maybe know what is going on @mxii-ca?