Cant start jupyter notebook in Anaconda3, because of error in import _ssl

Question

I just installed the latest Anaconda on windows 10 and wanted to start jupyter notebook with the anaconda prompt, but the following error occures. Although I think its a common problem I couldn't find a solution.

(base) C:\Users\Felix>jupyter notebook
Traceback (most recent call last):
  File "C:\Users\MyUser\Anaconda3\Scripts\jupyter-notebook-script.py", line 6, in <module>
    from notebook.notebookapp import main
  File "C:\Users\MyUser\Anaconda3\lib\site-packages\notebook\notebookapp.py", line 62, in <module>
    from tornado import httpserver
  File "C:\Users\MyUser\Anaconda3\lib\site-packages\tornado\httpserver.py", line 29, in <module>
    import ssl
  File "C:\Users\MyUser\Anaconda3\lib\ssl.py", line 98, in <module>
    import _ssl             # if we can't import it, let the error propagate
ImportError: DLL load failed: Die angegebene Prozedur wurde nicht gefunden.

Addition: I cant use pip to install something. The following message occures

WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
Could not fetch URL https://pypi.org/simple/pip/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/pip/ (Caused by SSLError("Can't connect to HTTPS URL because the SSL module is not available.")) - skipping

Answer 1

The reason for the error in this case is that some incompatible DLLs are loaded before the Anaconda's DLLs. One of the solutions is to use a special Anaconda DLL loading mode by setting the corresponding control environment variable in the Anaconda prompt:

set CONDA_DLL_SEARCH_MODIFICATION_ENABLE=1

PS: Not to set the variable on every startup manually, you can set it as a system environment variable .