How it works...
When an AD FS farm exists, AD FS servers can be added by specifying the primary AD FS server for the AD FS farms using WID, or the database specifics for the AD FS farms using SQL Server.
In an environment using WID, each AD FS server replicates the database from the primary AD FS server. Only this server has read/write access to the database. The AD FS Management tools can only be run on the primary server. The primary server is located through the DNS and the WID is replicated using TCP 80.
In an environment using SQL Server, each AD FS server communicates with the SQL Server for the database. Each server has read/write access to the database. The AD FS Management tools can be run on each AD FS server.
When multiple AD FS ...
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