I have looked at the Access Manager in the old environment, and did not see any SSO functionality being enabled.
The old environment does not have a psconsole, so I was not able to check the settings over there.
What bothers me, is that I do not know what kind of values should be stored in the sunPortalGatewayWWWAuthorization attribute. A basic http authentication string would look like this: Authorization: Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==