Understanding Why ISA Server re-prompts for Authentication when Passwords Expire

Introduction

There are times that the user does not change their password on the day that Group Policy forces a password change. Normally, if the user logs off and tries to logon again, Windows will inform him that his password is expired and require him to change it. ISA is not able to perform the same action as Windows.

This article describes what happens when the user’s domain password expires while he is trying to browse Internet through ISA Server and ISA Server uses a rule that requires authentication.

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Source: Understanding Why ISA Server re-prompts for Authentication when Passwords Expire