What do you mean by mixed mode authentication in .NET?

.NET supports three modes of authentication namely Forms Authentication, Windows Authentication and Passport Authentication. Your web application should use only one of these authentication mechanisms. But still .NET provides a workaround to use both Forms authentication and Windows authentication in the same web application.

When you use mixed mode authentication in your web application, the decision of authentication is made based on the User. If the User is an intranet user belonging to internal domain then windows authentication will be performed. If the User is an internet User logging from an external domain then Forms Authentication will be performed.

If you look at the internal working of mixed mode authentication, Forms authentication is the base. In case of intranet User, the User is verified using Windows Authentication and the user information is passed to Forms authentication and therefore the User will be authenticated via Forms Authentication as well. However there is an overhead. You have to create two different virtual directories in IIS for your web application.

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