A preview of AspNetWindowsAuthProvider was added in the v4.0.21 release, see:
https://github.com/ServiceStack/ServiceStack/blob/master/release-notes.md#windows-auth-provider-for-aspnetAlexandru Vasile Pop commented
Just to let you know that I am using this feature in production for a couple of months and it is working very nice (while solving a lot of issues that I had when using a ServiceStack v3 based workaround).Alexandru Vasile Pop commented
I have used this feature and seems to be working ok and fixes all the problems I had with windows authentication and servicestack.
I haven't used it side by side with other authentication method(not sure if even possible).
You can mark the issue as complete from my point of view.