We have Sharepoint 2010 with a custom STS, and claims provider that is built to work with this STS.
I want to give read permission to everybody that has a specific claim so I create a group in SharePoint, give read only permission to this group.
Inside this group I added the ReadOnly claim.
When a user tries to login to SharePoint, at the SharePoint site, the user gets "Access Denied Error" ; now if the user clicks go back to site, he can continue his singin succesfully. This is very consistent, in all browser, first login attempt always gets
"Access Denied" and when you click go back to site, it works.
Any ideas why the first attempt with a user who carries the claim gets access denied?
Note: All sites are configured with claims based authentication and to use sts as the provider. We confirm with network monitoring tool that SharePoint receives the claim. (If not, then go back to site would work I guess).
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