As far as I know, Primary Group is a term that only exist in MSAD. The explanation to this kind of group as per this article is the following:
This behavior occurs because Microsoft Windows 2000 has a group membership limitation of 5000 users. This behavior is due to a limitation in the size of the attribute that is being replicated. The primary group allows one group per user to hold more than 5000 users. By default, every user is a member of the Domain Users group.
The Microsoft Windows Server 2003 Forest mode removes this group membership limitation. However, the primary group is still used in the same way.
Also, a Primary Group list its members in a different way, it does not include attribute like member or memberOf. From Crowd version 2.7 onwards the primaryGroupId attribute is pulled from AD as indicated in this ticket, however it's still not in Confluence and JIRA.
Thanks, if that's the case, I guess there is little use for it in my case. I was looking more for a way to identify anyone from AD. As you know Crowd, JIRA and Confluence do not map authenticated user to a group, meaning that it's imposibile to distinguish between any-authenticated user and any-user.
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