Unable to access Protected URL user_name variable

[alreed]

When protecting a URL from within the Plesk 8.2 framework I'm unable to grab Server Variables relating to user_name. Authentication Prompt and login are successful, however I'm unable to identify the user who has logged in.

Server Variables Not Populated:
AUTH_USER
LOGON_USER
HTTP_DAFLOGIN

How do I get the user's login name?

 

[HussainA]

Facing the same issue. Were you able to solve it?