When session is lost it happens that the user is not redirected to IdP login pageDescriptionWhen a user is logged into an instance and the session is lost it happens that the user is not redirected to IdP login page. Instead the user stays on the same page, like the portal page and even after refresh the user is not redirected to the IdP login page. It is only when the user removes portal prefix for example from: "https://yourinstance.service-now.com/sp" to "https://yourinstance.service-now.com" that the user is correctly redirected to IdP login page.ResolutionSetting the default login page to unpublic resolves the issue