Here is a bit of his code and a note from him.

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The problem is it's using the iis user

        public bool AuthenticateWithRequestId()

        {

            var ctx = System.Web.HttpContext.Current;

            var winId = ctx.User.Identity as WindowsIdentity;

            //// if there's no usable identity attached, return a 401

            //if (winId == null || winId.IsAnonymous)

            //{

            //    ctx.Response.StatusCode = 401;

            //    ctx.Response.StatusDescription = "Unauthorized";

            //    ctx.Response.End();

            //    return false;

            //}

            // start impersonating

            using (var impersonationContext = winId.Impersonate())

            {

                // authentication to LF will use the current identity

                Session sess = new Session();

                sess.ApplicationName = ApplicationName;

                sess.LogIn(new RepositoryRegistration(LaserficheHost, RepositoryName));

                RaSession = sess;

            }

            return true;

        }