Certificate Verify Failed

[Electr0Fi]

I just ran the following example code:

from mvg import MvgApi

station = MvgApi.station('Universität, München')
if station:
    mvgapi = MvgApi(station['id'])
    departures = mvgapi.departures()
    print(station, departures)

And the script crashes with the following Traceback:

Traceback (most recent call last):
  File "C:\Users\REDACTED\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.13_qbz5n2kfra8p0\LocalCache\local-packages\Python313\site-packages\aiohttp\connector.py", line
 1123, in _wrap_create_connection
    connection = await self._loop.create_connection(
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        *args, **kwargs, sock=sock
        ^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.13_3.13.752.0_x64__qbz5n2kfra8p0\Lib\asyncio\base_events.py", line 1193, in create_connection
    transport, protocol = await self._create_connection_transport(
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ...<2 lines>...
        ssl_shutdown_timeout=ssl_shutdown_timeout)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.13_3.13.752.0_x64__qbz5n2kfra8p0\Lib\asyncio\base_events.py", line 1226, in _create_connection_transport       
    await waiter
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.13_3.13.752.0_x64__qbz5n2kfra8p0\Lib\asyncio\sslproto.py", line 581, in _on_handshake_complete
    raise handshake_exc
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.13_3.13.752.0_x64__qbz5n2kfra8p0\Lib\asyncio\sslproto.py", line 563, in _do_handshake
    self._sslobj.do_handshake()
    ~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.13_3.13.752.0_x64__qbz5n2kfra8p0\Lib\ssl.py", line 951, in do_handshake
    self._sslobj.do_handshake()
    ~~~~~~~~~~~~~~~~~~~~~~~~~^^
ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1028)

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "C:\Users\REDACTED\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.13_qbz5n2kfra8p0\LocalCache\local-packages\Python313\site-packages\mvg\mvgapi.py", line 120, in __api
    async with aiohttp.ClientSession(trust_env=True) as session, session.get(
                                                                 ~~~~~~~~~~~^
        url.url,
        ^^^^^^^^
    ) as resp:
    ^
  File "C:\Users\REDACTED\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.13_qbz5n2kfra8p0\LocalCache\local-packages\Python313\site-packages\aiohttp\client.py", line 1425, in __aenter__
    self._resp: _RetType = await self._coro
                           ^^^^^^^^^^^^^^^^
  File "C:\Users\REDACTED\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.13_qbz5n2kfra8p0\LocalCache\local-packages\Python313\site-packages\aiohttp\client.py", line 703, in _request
    conn = await self._connector.connect(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        req, traces=traces, timeout=real_timeout
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "C:\Users\REDACTED\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.13_qbz5n2kfra8p0\LocalCache\local-packages\Python313\site-packages\aiohttp\connector.py", line
 548, in connect
    proto = await self._create_connection(req, traces, timeout)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\REDACTED\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.13_qbz5n2kfra8p0\LocalCache\local-packages\Python313\site-packages\aiohttp\connector.py", line
 1056, in _create_connection
    _, proto = await self._create_direct_connection(req, traces, timeout)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\REDACTED\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.13_qbz5n2kfra8p0\LocalCache\local-packages\Python313\site-packages\aiohttp\connector.py", line
 1414, in _create_direct_connection
    raise last_exc
  File "C:\Users\REDACTED\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.13_qbz5n2kfra8p0\LocalCache\local-packages\Python313\site-packages\aiohttp\connector.py", line
 1383, in _create_direct_connection
    transp, proto = await self._wrap_create_connection(
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ...<7 lines>...
    )
    ^
  File "C:\Users\REDACTED\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.13_qbz5n2kfra8p0\LocalCache\local-packages\Python313\site-packages\aiohttp\connector.py", line
 1129, in _wrap_create_connection
    raise ClientConnectorCertificateError(req.connection_key, exc) from exc
aiohttp.client_exceptions.ClientConnectorCertificateError: Cannot connect to host www.mvg.de:443 ssl:True [SSLCertVerificationError: (5, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1028)')]

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "c:\Users\REDACTED\Documents\Coding\LaMetric\LaMetric_MVG.py", line 3, in <module>
    station = MvgApi.station('Universität, München')
              ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\REDACTED\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.13_qbz5n2kfra8p0\LocalCache\local-packages\Python313\site-packages\mvg\mvgapi.py", line 286, in station
    return asyncio.run(MvgApi.station_async(query))
           ~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.13_3.13.752.0_x64__qbz5n2kfra8p0\Lib\asyncio\runners.py", line 195, in run
    return runner.run(main)
           ~~~~~~~~~~^^^^^^
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.13_3.13.752.0_x64__qbz5n2kfra8p0\Lib\asyncio\runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.13_3.13.752.0_x64__qbz5n2kfra8p0\Lib\asyncio\base_events.py", line 725, in run_until_complete
    return future.result()
           ~~~~~~~~~~~~~^^
  File "C:\Users\REDACTED\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.13_qbz5n2kfra8p0\LocalCache\local-packages\Python313\site-packages\mvg\mvgapi.py", line 246, in station_async
    result = await MvgApi.__api(Base.FIB, Endpoint.FIB_LOCATION, args)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\REDACTED\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.13_qbz5n2kfra8p0\LocalCache\local-packages\Python313\site-packages\mvg\mvgapi.py", line 133, in __api
    raise MvgApiError from exc
mvg.mvgapi.MvgApiError

It seems that the SSL Certificate for the connection to MVG API fails to verify, as the script is "unable to get local issuer certificate".

Is this just an issue on my system or are others experiencing it as well?

I already have certifi installed and upgraded, and have installed pip-system-certs

[mondbaron]

On Windows, especially with the Microsoft Store version of Python, the CA certificates are sometimes not installed by default.

• As you did, run the following command in your terminal: python -m pip install --upgrade certifi

• Then, run: python -m certifi This will print the path to the CA bundle.

• You may need to set the environment variable SSL_CERT_FILE to this path: set SSL_CERT_FILE=<path printed by python -m certifi>