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Sitefinity 3.x works with extended ASP.NET Membership and Role providers - our providers inherit from the ASP.NET ones. The 3.x version is designed to work with mulitple membership and role providers. You can just declare them in their respective sections in the web.config. The back-end of Sitefinity however works with only one provider at a time - you can either use the built in one or a custom one. This article
explains how to work with multiple providers. If you intend on using the built in one for back-end access all you need to do is declare the providers for roles and members.
For Sitefinity 4.0 we do not yet have documentation on how to work with multiple providers. The beta version of the system only supports managing users and roles from multiple membership providers though. In order to configure a new membership or role provider you will need to go to Configurations->Security and add the membership and role providers under the respective sections. In the ProviderType field you will refer your provider type. Then when the provider is added you will need to expand its parameters section and add parameters you need, for example applicationName and set it to Custom/. Finally you need to restart the website. After this when you go to Users or Roles you will be able to create users and roles in your custom providers.
All the best,
the Telerik team
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