We are currently in the progress of integrating Sitefinity to work with Claims which will allow us to support Single Sing On for multiple Sitefinity instances and Windows Authentication. It is still in our R&D department but the current progress is showing some very good results. There is a high chance that this functionality will be part of our upcoming Sitefinity 4.4 release scheduled for mid-December. I want to assure you that we have dedicated enough resources to make this happen, and we understand the importance of this feature for our clients.
Stay tuned for any further updates and announcements on our blogs.
the Telerik team
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