SSL: CERTIFICATE_VERIFY_FAILED

[StephenLeonardGreen]

I had a fresh install of Windows 11, and after downloading the most recent versions of Python and Java as mentioned in the prerequisites, I followed the instructions mentioned here however when attempting to run the program on the example, I get this error.

(base) C:\Users\grims>stepcount sample.cwa.gz
Decompressing... Done! (0.73s)
Reading file... Done! (8.28s)
Converting to dataframe... Done! (2.63s)
Getting stationary points... Done! (5.96s)
Gravity calibration... Done! (2.08s)
Nonwear detection... Done! (5.11s)
Resampling... Done! (1.92s)
Downloading https://wearables-files.ndph.ox.ac.uk/files/models/stepcount/ssl-20230208.joblib.lzma...
Traceback (most recent call last):
File "C:\Users\grims\miniconda3\lib\urllib\request.py", line 1348, in do_open
h.request(req.get_method(), req.selector, req.data, headers,
File "C:\Users\grims\miniconda3\lib\http\client.py", line 1282, in request
self._send_request(method, url, body, headers, encode_chunked)
File "C:\Users\grims\miniconda3\lib\http\client.py", line 1328, in _send_request
self.endheaders(body, encode_chunked=encode_chunked)
File "C:\Users\grims\miniconda3\lib\http\client.py", line 1277, in endheaders
self._send_output(message_body, encode_chunked=encode_chunked)
File "C:\Users\grims\miniconda3\lib\http\client.py", line 1037, in _send_output
self.send(msg)
File "C:\Users\grims\miniconda3\lib\http\client.py", line 975, in send
self.connect()
File "C:\Users\grims\miniconda3\lib\http\client.py", line 1454, in connect
self.sock = self._context.wrap_socket(self.sock,
File "C:\Users\grims\miniconda3\lib\ssl.py", line 513, in wrap_socket
return self.sslsocket_class._create(
File "C:\Users\grims\miniconda3\lib\ssl.py", line 1071, in _create
self.do_handshake()
File "C:\Users\grims\miniconda3\lib\ssl.py", line 1342, in do_handshake
self._sslobj.do_handshake()
ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate in certificate chain (_ssl.c:997)
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\grims\miniconda3\lib\runpy.py", line 196, in _run_module_as_main
return _run_code(code, main_globals, None,
File "C:\Users\grims\miniconda3\lib\runpy.py", line 86, in run_code
exec(code, run_globals)
File "C:\Users\grims\miniconda3\Scripts\stepcount.exe_main.py", line 7, in
File "C:\Users\grims\miniconda3\lib\site-packages\stepcount\stepcount.py", line 55, in main
model = load_model(args.model_path or model_path, args.model_type, check_md5, args.force_download)
File "C:\Users\grims\miniconda3\lib\site-packages\stepcount\stepcount.py", line 335, in load_model
with urllib.request.urlopen(url) as f_src, open(pth, "wb") as f_dst:
File "C:\Users\grims\miniconda3\lib\urllib\request.py", line 216, in urlopen
return opener.open(url, data, timeout)
File "C:\Users\grims\miniconda3\lib\urllib\request.py", line 519, in open
response = self._open(req, data)
File "C:\Users\grims\miniconda3\lib\urllib\request.py", line 536, in _open
result = self._call_chain(self.handle_open, protocol, protocol +
File "C:\Users\grims\miniconda3\lib\urllib\request.py", line 496, in _call_chain
result = func(*args)
File "C:\Users\grims\miniconda3\lib\urllib\request.py", line 1391, in https_open
return self.do_open(http.client.HTTPSConnection, req,
File "C:\Users\grims\miniconda3\lib\urllib\request.py", line 1351, in do_open
raise URLError(err)
urllib.error.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate in certificate chain (_ssl.c:997)>

[chanshing]

What version of python are you using? Is it 3.11? You can try python --version
Is it MacOS? @angerhang I think you had a similar issue before.

[angerhang]

Yeah I suspect it is also the Python version that is not right. Make sure you use Python >= 3.8.

[StephenLeonardGreen]

I used the most recent version of Python which was 3.10.9 along with Java 1.8.0_361 and then followed the video using Miniconda3 on Windows as advised.

[chanshing]

@StephenLeonardGreen Are you able to download https://wearables-files.ndph.ox.ac.uk/files/models/stepcount/ssl-20230208.joblib.lzma from any browser? If you click the link, does it download a file?

[StephenLeonardGreen]

I was able to download the file separately but not through the code.

I just tried this again with the same Python/Java versions on a Windows 10 computer without an issue so I think the issue might be to do with Windows 11. Can anything be done about this?