Explain federated identity with ADFS.

[bob]

You set up federated identity so one system trusts logins from another without extra accounts popping up everywhere. I see it as passing user details across boundaries using claims instead of full directory copies. ADFS runs on your server to manage those trusts with partners or cloud services. You pick which attributes get sent over during authentication. Then the remote side accepts them as valid proof.
Now you configure the federation metadata to exchange details automatically between sides. I found that step saves tons of manual work when things change later. Your users hit the login page once and get through to external resources right away. But you still control what info leaves your environment. Perhaps test the trust first in a lab setup before going live. Also watch the event logs for any claim mismatches that break access.
Or think about how ADFS turns your directory into an identity provider for outsiders. I handle claims rules to filter or transform data before it travels out. You map attributes like group membership to roles on the other end. Then sessions stay active across sites until tokens expire. Maybe add multi factor checks if the partner demands extra security layers. Now the whole flow feels seamless once tuned right.
You deal with certificate renewals that keep the secure channel alive between federated parties. I always check expiration dates early to avoid sudden breaks. Your ADFS farm can grow with more nodes for better uptime during peaks. But single points like the proxy servers need monitoring too. Perhaps script alerts for performance hits that slow authentications. Also review the relying party trusts often as partners update their setups.
Federated identity cuts down password resets across organizations you work with. I notice fewer support tickets after rolling this out properly. You gain single sign on benefits without merging entire directories. Then users stay productive longer without jumping through hoops. Or consider the audit trails ADFS generates for compliance reviews later. Now those logs help trace who accessed what from outside.
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