Capturing users userid

From: basin (
Date: 07/17/03

Date: Thu, 17 Jul 2003 07:58:53 -0700

I support infrastructure, I am not a developer. I am
having a hard time helping a developer to get her site to
work in production.
Her app uses sql integrated security, which we have
working fine now on both dev and prod environments. She
also captures the the users domain id with some kind
of .net server variables. This works in dev, but not in
prod for some reason, it wont capture the user's id.
Should I be focusing on the IIS properties or the NT ACLs
for this site. They are set up the same on dev and prod.
I'm Lost! Anything will help.