Citrix Desktop Director Auto Fill Domain Name

Edit C:\inetpub\wwwroot\DesktopDirector\LogOn.aspx with admin token
Replace

<asp:TextBox ID="Domain" runat="server" CssClass="text-box" ></asp:TextBox>

With

<asp:TextBox ID="Domain" Text="MULPURU.LOCAL" readonly="true" runat="server" CssClass="text-box"></asp:TextBox>

Result