Web Application Needing to Validate Users From Different Domains

A company I had done some work for has a process that they go through for their custom application.  This application must authenticate the user so it can do pass-through authentication.  Their process grabs the sAMAccountName attribute from the user object.  contoso.com\richpec would, of course, have the sAMAccountName of richpec.  Then they use the REMOTE_USER…

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