Event ID 646 — Trust Policy and Configuration

Applies To: Windows Server 2008

The Active Directory Federation Services (AD FS) trust policy file defines the set of parameters that a Federation Service requires to identify partners, certificates, account stores, claims, and the various properties of these entities that are associated with the Federation Service.

Event Details

Product: Windows Operating System
ID: 646
Source: Microsoft-Windows-ADFS
Version: 6.0
Symbolic Name: ConfigStringInvalid
Message: The Federation Service encountered an error while loading the trust policy. The trust policy field '%1' is empty.
Field: %1

If this error occurs during startup of the Federation Service, the Federation Service will be not be able to start, and all requests to the Federation Service will fail until the configuration is corrected. If this error occurs while the Federation Service is running, the Federation Service will continue to use the last trust policy that was loaded successfully.

User Action
This should occur only if the trust policy file has been modified without use of the AD FS administrative tools. Add data to the '%1' field.


Review the script for creating the trust policy

This error occurs only if the trust policy file has been modified without the use of the Active Directory Federation Services snap-in.

Check the script for creating the trust policy. Make sure 0 length of string (null or empty string) is not passed as the argument to any functions that are exposed by the trust policy object model.


Verify that you can access the Active Directory Federation Services (AD FS)-enabled application from a client browser and that the resource can be accessed.

Trust Policy and Configuration

Active Directory Federation Services