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You may need to update the domain password assigned to the AD FS 2.0 service account in Active Directory Domain Services (AD DS). After the password for the service account has been changed in AD DS, you will then need to update the AD FS AppPool and the AD FS service account on all federation servers in a Windows Internal Database (WID)-based federation server farm to mirror the new domain password. Use the following procedure to update both the AD FS AppPool and the AD FS 2.0 service account password on each federation server in a WID-based federation server farm to match the new domain password that was changed in AD DS.
NOTE: Use this procedure on all of the secondary federation servers first. Once all secondary federation servers in the WID-based federation server farm have been updated, apply this procedure to the primary federation server.
Click Start, point to All Programs, point to Administrative Tools, and then click Internet Information Services (IIS) Manager.
Repeat these steps on all federation servers in the WID-based federation server farm.
Changing the AD FS 2.0 Service Account Password for a SQL Server-Based Federation Server Farm, Click here