Event ID 669 — Federation Service Proxy Logging

Applies To: Windows Server 2008 R2

You can use Active Directory Federation Services (AD FS) log files to troubleshoot issues with the federation server proxy. The creation and updating of AD FS log files are monitored here.

Event Details

Product: Windows Operating System
ID: 669
Source: Microsoft-Windows-ADFS
Version: 6.1
Symbolic Name: LogFileCannotCreateFile
Message: The AD FS troubleshooting log is not able to create a log file.
Directory: %2
File to be created: %3
File creation error: %4

Troubleshooting information will be lost until this condition is corrected. This event will recur every %1 minutes until the condition is corrected.
Retry period: %1

User Action
Check the permissions on the log file directory.


Grant the ADFSAppPool identity Write/Full Control privileges to the log file directory

Check the permissions on the log file directory. The ADFSAppPool identity should have Write/Full Control privileges to the log file directory.


Verify that Active Directory Federation Services (AD FS) log files have been generated in the log files directory.

To perform this procedure, you must be a member of the local Administrators group, or you must have been delegated the appropriate authority.

To locate the log files directory

  1. On the federation server, click Start, point to Administrative Tools, and then click Active Directory Federation Services.
  2. In the console tree, right-click Federation Service and then click Properties.
  3. On the Troubleshooting tab, check the location of the log files under Log files directory.

Federation Service Proxy Logging

Active Directory Federation Services