Circular references in Active Directory

Recently in user feedback on Team Foundation Sidekicks application we have dealt with issue that may be of importance to people with complex Active Directory dependencies between user groups.

To put it simple - if you have circular relationships between user groups in AD and those groups are used in TFS, IGroupSecurityService ReadIdentity method will fail. I did not see it but on one occasion and do not know how that API is used in TFS core, but my experience with Active Directory tells me that circular relationship is not something very rare to come by.

So if you feel that way also, have a look on the following post.