Which HTTP authentication methods are supported by Team Calendar subscription in Confluence?

I want to create a small .NET service which provides some events in ICS format to Team Calendars for for Confluence.

First I want to try which authentication is supported so I put a static ICS file with several events to my website. I create a calendar using my own URL: https://mysite/myfolder/file.ics. IIS 8.5 and Windows Server 2012 R2 are used.

If I enable Anonymous access, Team Calendar downloads the ICS file and shows it. It’s perfect. If I disable Anonymous access and Enable Windows, Digest and Basic authentication too, Team Calendars doesn’t connect, it says authentications error has occurred. I can download this file via browser with my username and password, of course.

So which authentication methods are supported by team calendar?

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