The account you have used to login belongs to a role that has no permissions to access the dashboard and the cms. You need to grant the proper permissions to this role or use DestinationPageUrl
property if you want to forward the request. You were not able to access the backend or other part of the cms, because the cookie of the authenticated user was stored in the NameValueCollection. Accessing the backend login page(/sitefinity/login.aspx) directly or fronted login should have allowed you to use another credentials instead of closing the browser and application.
All the best,
the Telerik team
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