Given a scenario where a web hosted IdentityServer3 only handles authorization, being user authentication handled by an external custom service, what is required to implement to support this? A custom OWIN middleware?
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Either connect to your "external custom service" form within your IUserService (idsrv specific) - or treat it as an external identity provider. In that case you need to write a Katana authentication middleware for it (reusable Katana component).
For the UserService check the IdentityServer docs. For Katana authentication middleware - not sure if there is official documentation for that - I covered that briefly it in my Web API security course.

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Why would you choose one or the other? Could you enhance your answer with this information and implementation guides for both? – vvolkgang May 21 '15 at 10:05
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1posted a new question based on your answer [here](http://stackoverflow.com/questions/30485401/substitute-identityserver3-login-system) – vvolkgang May 27 '15 at 15:04