a0494a2a_ng__404_Not_Found_Error__Files__Category
[Comments and examples] Some applications and websites may exist in multiple contexts. For example, there may be an internal version of a corporate website with additional URLs (e.g. staff directory) which are not present on the external public site. This may be harder for internal users to identify if DNS is configured so that internal users see the internal site on the real domain. Links may be used from outside or sent to third parties. [Category] 
Unacceptable URLs
Benign Unexpected URLs - Part 1 - Missing (404 Not Found Error) Files