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The problem may be that the certifi package needs to be updated.

• For Mac OS try the solution suggested on Stack Overflow: ssl-certificate verify failed with python3

  • Go to the folder where Python is installed, e.g., on Mac OS it is installed in the Applications folder with the folder name 'Python 3.x' where '3.x' is your Python version

  • Double click on 'Install Certificates.command'.

• If you are not using Mac OS, or have a different setup and cannot find the 'Install Certificates.command' file, then try to update certif with pip

  No Format
  pip install --upgrade certif

  
  

If this does not solve the problem, then it may be that the SSL library used in this Python version doesn't look in the correct certificate path.

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If you have the SSL error in the last step of your request (Transferring from...), you need to install the Root CA for "stream.ecmwf.int": QuoVadis Global SSL ICA G2

• The following is an a hack for cases when updates are not possible for whatever reason:

  • Disable SSL Verification, this can be achieved by setting CURL_CA_BUNDLE="" before calling the python api:
    • CURL_CA_BUNDLE="" python main.py

• • Specify the Root CA directly, this can be achieved by setting REQUESTS_CA_BUNDLE="path to ROOT ca QuoVadis Root CA 2 G3" downloaded from the Quovadis Website (that your system cannot find somehow):
    • REQUESTS_CA_BUNDLE="/path_to_cert/QuoVadis_Root_CA_2_G3.pem" python main.py
      
      

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