One of the new features in FIM 2010 R2 (currently BETA) is the addition of the extranet scenario for the SSPR (Self Service Password Reset). This feature comes with additional IIS websites and thus authentication configuration to perform. The goal of this
article is to explain which SPN’s (Service Principal Names) to register and what delegation to configure.
article written for FIM 2010 we considered the following services:
Now we are adding two new services:
Now bear in mind that that we are not focusing on the overall component design. The following information is correct whether all roles (services) are installed on the same box or separated in a multi-tier setup.
For these sites we use a new service account, namely sa_fimpw. I choose to use it for both sites. For now I don’t see any real benefit in splitting this across two service accounts.
The following delegation configurations should be put in place:
So in words: both the password site application pool identities and the FIM portal application pool identity have to be trusted for delegation to the FIMService SPN. And the FIM Service account should also trusted to the FIMService SPN.
Choosing dedicated URL’s to designate your services might seem overkill, or overly complex. But when combining more and more roles on the same server it's a necessity. By adding dedicated service accounts/application pool identities you are making the setup
“understandable” and extremely flexible.
Using the name of your server to access all services on that box might seem a lot easier to setup, but in the end it's a lot more complex to configure, understand and support. Also from an end-user perspective it’s absurd. For instance do you want your users
to use these URLs:
Don't you think they’ll be better off with this:
The FIM 2010 R2 Service & Portal installer perfectly supports this concept (which uses IIS Host Headers in the background to allow multiple sites to use port 80). So go forward!