Just as a FYI for those CRM admins that don’t deal with infrastructure issues a lot, or have to request from a different group firewall changes, when setting up IFD for external users, with CRM 2011 on a box, and ADFS on a different one, both machines have to expose port 443 through the firewall (AD FS 2.0 binds to port 443, and assuming you set-up CRM on 443 also). Do not forget about the ADFS box, or you’ll be pulling your hair out trying to figure out what’s going on!

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Check out the white paper from Microsoft Download Center.

Enjoy!

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