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Third-party authentication mechanisms will not work with the default landing page action because the default landing page action is currently only supported for the internal Liferay portal authentication mechanism.
When system administrators define the “default landing page” via the Portal Settings in the Control Panel, or via portal property default.landing.page.path in their portal-ext.properties file, the landing page path is ignored for auto login mechanisms such as OpenSSO because the auto login mechanisms do not go through the default Liferay portal authentication.
Resolution
One possible workaround is to develop a custom post login landing page action (PostLoginLandingPageAction) which triggers a HTTP redirect and takes the web browser to private pages for the target web site hosted by Liferay Portal. Do keep in mind that any assistance with this process would be considered custom development.