I noticed that archived pages of a knowledge base linked to a support portal are accessible via the support portal. Customer would like to restrict the archived page access for the user
 
Observations:

• Archived pages can't be searched directly within the portal.
• Users can access and view an archived page if there is a link added for archived page on a current page.
• Users can also access an archived page if they have a direct link to it.
• This functionality is in accordance with the design for viewing permissions for archived pages. 
   
  Related document: https://support.atlassian.com/confluence-cloud/docs/archive-pages/