Depending on different role(s) permissions set on the specific node or content type, the administrator can specify messages accordingly.

When a 404 error is encountered a message instructing the user on how to obtain the required role will be displayed.

Installation:

Unpack in your modules folder (usually '/sites/all/modules/')
Enable under Administer > Site Building > Modules
Go to Administer >> Site configuration >> Error Reporting
Under Default 403 (access denied) page enter custom_403 as the path

Here are some key features of "Custom 403":

· Supports role based node access for both content type level and per node level.

Requirements:

· Drupal 6.x
· Drupal Content Access Module