The use of the word portals is confusing. I call on Microsoft to rationalize their terminology!
Redirecting in the portal is straightforward but syntax is important!
In theming a portal to look-and-feel like a corporate web site, I run across a variety of items that I'm grouping in this blog.
I recently came across a technical requirement to remove the banner graphic from the top of the default Forum page of the Community Portal. This was a little trickier than expected!
A new feature with the latest release is the ability to redirect users to a 'Under Construction' page and prevent anyone from accessing the site.
The Dynamics 365 Customer Engagement portal authenticates logins against a 'web portal' enabled Contact record. Authorization is provided by the .NET platform. In addition to this local authentication process, authentication can be enabled to allow Facebook, Google, and Azure AD to authenticate. Where client requirements look to restrict 'data at rest' and 'data in transit' to specific geographic locations, it is likely that these authentication methods are disabled.