On the windows-machine I do have a software with an API. The authentication method of the API is via the windows-authentication. Then I try to access the API via Google Chrome (http://localhost:58454/...) I get the expected results. A XML-File with the data stored in the database of the software. However, my goal is to access the API via Python http.client / urllib.request. When I try to access the API via Python I get a 401-error: Untauthorized. The same is when I try to access the API via Microsoft Edge. The browser is asking me a username and password. I don't know why Google Chrome don't ask for a username and password. However, the main question is: What is the username and password for the windows-machine? It's actually not the username and password for the Mac. I already tried this.