$ python3.9 test.py 
python version: 3.9.14 (main, Sep  7 2022, 00:00:00) 
[GCC 12.2.1 20220819 (Red Hat 12.2.1-1)]
cherrpy version: 18.6.0
[17/Sep/2022:01:17:23] ENGINE Listening for SIGTERM.
[17/Sep/2022:01:17:23] ENGINE Listening for SIGHUP.
[17/Sep/2022:01:17:23] ENGINE Listening for SIGUSR1.
[17/Sep/2022:01:17:23] ENGINE Bus STARTING
CherryPy Checker:
The Application mounted at '' has an empty config.

[17/Sep/2022:01:17:23] ENGINE Started monitor thread 'Autoreloader'.
[17/Sep/2022:01:17:23] ENGINE Serving on https://0.0.0.0:4400
[17/Sep/2022:01:17:23] ENGINE Bus STARTED
[17/Sep/2022:01:17:23] ENGINE Error in HTTPServer.serve
Traceback (most recent call last):
  File "/home/toppk/.local/lib/python3.9/site-packages/cheroot/server.py", line 1823, in serve
    self._connections.run(self.expiration_interval)
  File "/home/toppk/.local/lib/python3.9/site-packages/cheroot/connections.py", line 203, in run
    self._run(expiration_interval)
  File "/home/toppk/.local/lib/python3.9/site-packages/cheroot/connections.py", line 246, in _run
    new_conn = self._from_server_socket(self.server.socket)
  File "/home/toppk/.local/lib/python3.9/site-packages/cheroot/connections.py", line 300, in _from_server_socket
    s, ssl_env = self.server.ssl_adapter.wrap(s)
  File "/home/toppk/.local/lib/python3.9/site-packages/cheroot/ssl/builtin.py", line 277, in wrap
    s = self.context.wrap_socket(
  File "/usr/lib64/python3.9/ssl.py", line 501, in wrap_socket
    return self.sslsocket_class._create(
  File "/usr/lib64/python3.9/ssl.py", line 1041, in _create
    self.do_handshake()
  File "/usr/lib64/python3.9/ssl.py", line 1310, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLZeroReturnError: TLS/SSL connection has been closed (EOF) (_ssl.c:1129)