Users don't load Sitefinity

Question

I'm having an issue with SitefinityMembershipProvider in Sitefinity 9.1

When I login to the backend, navigate to Administration -> Users:Page keeps loading.
When I checked the error log it tells me that "Provider must implement the class 'System.Web.Security.MembershipProvider".

But my class inherits sitefinity membership provider i.e. MembershipDataProvider which is of type Telerik.Sitefinity.Security.Data.

My web config have the following membership defined.

<membership defaultProvider="Default">
    <providers>
        <clear />
        <add name="Default" type="Telerik.Sitefinity.Security.Data.SitefinityMembershipProvider, Telerik.Sitefinity" />
        <add name="CredentialServiceProvider" type="SitefinityWebApp.Providers.CredentialServiceProvider" />
    </providers>

Answer 1

You need to register the provider in the Security settings as explained here:

http://docs.sitefinity.com/custom-membership-provider-add-the-new-provider-to-the-sitefinity-providers-collection

Answer 2

Additionally, I had to remove the custom provider from the web.config

<providers>
    <clear />
    <add name="Default" type="Telerik.Sitefinity.Security.Data.SitefinityMembershipProvider, Telerik.Sitefinity" />
</providers>