Allow multiple authentication methods in claims based web application

Question

Web applications using CMA (Classic Mode Authentication) need to be setup with different Zones if it is to accommodate different types of CMA methods. This is called 'extending a web application'. In web apps using CBA (Claims Based Authentication), how do you allow for multiple authentication methods, as you do not have to 'extend it'?

Answer 1

If you already created a webapplication with claim based authentication.

• Open Central Administration
• Go to the webapplication list en select your webapplication
• In the ribbon - click Authentication providers

Answer 2

When I enable both {NTLM,forms} This causes my web service calls to throw 401 unauthorized error codes. If I disable forms then all webservices calls work.