Hello I've got a problem about authentication between two different SharePoint Farms. Farm 1 - Main Farm - Extranet with FBA (works like a charm) Farm 2: - I created a trust between "Farm 1" en "Farm 2". I can view my taxonomy from Farm 1. - I created an Identity Provider which points to the STS of my "Farm 1". I configured my authentication provider on the WebApp to point to that Identity Provider. - I can search for FBA-accounts in the people picker, so I receive identities from "Farm 1" to "Farm 2" and I can give them some permissions... But the problem is when I go to "Farm 2", choose for my own Identity Provider, i'll be redirected to the login page of "Farm 1" (so far so good). the authentication is succesfull but he's not bringing me back to the original 'source' (url in the querystring), in my case "Farm 2". I'm correctly logged in at that time into "Farm 1"... When I navigate manually back to "Farm 2" he automatically redirects me back to the login page of "Farm 1"... I see a lot of examples on the internet about authentication against your own Secure Token Service Or LiveID but I want to use the Secure Token Service of another SharePoint farm because all my trusted claims are over there. Any idea? thx in advance!!