Confirm forms-based authentication not selected on the Exchange front-end server Forms-based authentication can be configured on the Exchange front-end server when not using ISA Server to publish Exchange Web client access. When ISA Server is being used to publish Exchange Web client access, forms-based authentication should only be configured on the ISA Server computer. Perform the following procedure to confirm that forms-based authentication is not selected on the Exchange front-end server.
To confirm forms-based authentication is not selected on an Exchange front-end server Start Exchange System Manager. If administrative groups are enabled, expand Administrative Groups.
Expand Servers, and then expand your front-end server.
Expand Protocols, expand HTTP, right-click Exchange Virtual Server, and then click Properties. Click the Settings tab, and clear the check box Enable Forms Based Authentication.
Click OK. If you receive a message that states that Internet Information Services (IIS) must be restarted, click OK.
To restart IIS, type the following command at a command prompt: iisreset.