Workaround. If OpenSSO Enterprise 8.0 Update 1 is deployed on IBM WebSphere Application Server 7.0 on Windows:
Prefix the Keytab File Name property of the Windows Desktop SSO authentication module instance with file:///. For example:
file:///C:/keytabs/ssohost-4100-04.HTTP.keytab
Set the new com.sun.identity.authentication.module.WindowsDesktopSSO.Krb5LoginModule property to com.ibm.security.auth.module.Krb5LoginModule.
Set this new property using ssoadm or in the OpenSSO Enterprise Admin Console under Configuration, Sites and Server, opensso-instance-name, and Advanced. Then, restart the WebSphere Application Server 7.0 instance for the value to take effect.