I have been working with FedAuth cookie and sometimes rtFA cookie with Office365 authentication. Recently I came across SPOIDCRL cookie while logging in using .NET library, but I couldn't find much information on that, or the related library IDCRL. Questions:

  • What is the IDCRL libraray, when and how is it used? How does it fit into the big picture of authentication generally? (so far all I got from my search is that it appears to be used heavily by various Online apps)

  • What is SPOIDCRL or other IDCRL cookie? How is it related to the other common claim based cookies (FedAuth)?

1 Answer 1


To the best of my understanding is that not much has changed. SharePoint Online is now looking for SPOIDCRL cookie rather than FedAuth cookie. The FedAuth cookie was used and depended a lot on ADFS. The new SPOIDCRL is now using Azure AD Sync Service.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.