ISA Server 2006 form base authentication problem using UPN logon format on a multiple domain environmenthttp://blogs.technet.com/isablog/archive/2008/04/17/isa-server-2006-form-base-authentication-problem-using-upn-logon-format-on-a-multiple-domain-environment.aspx1. Understanding the Environment The scenario that I’m going to describe on this post was based on a case where the customer’s need was really specific and the configuration of the ISA Server was restricted by the company’s hardening policy. The topologyen-USCommunityServer 2.1 SP1 (Build: 61025.2)May 2008 - Technical Rollup Mail - Internethttp://blogs.technet.com/isablog/archive/2008/04/17/isa-server-2006-form-base-authentication-problem-using-upn-logon-format-on-a-multiple-domain-environment.aspx#3048082Thu, 01 May 2008 10:32:31 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3048082Technical RollUp<p>News Microsoft Internet Security and Acceleration Server Forefront Threat Management Gateway, the Next</p> ISA / IIS / Biztalk / WSPS / MOSS Info for the Month of Aprilhttp://blogs.technet.com/isablog/archive/2008/04/17/isa-server-2006-form-base-authentication-problem-using-upn-logon-format-on-a-multiple-domain-environment.aspx#3060569Sat, 24 May 2008 21:03:27 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3060569Heavy on the Technical<p>News Microsoft Internet Security and Acceleration Server Forefront Threat Management Gateway, the Next</p>