Hi,

I have modified the Login.ascx and Login.ascx.resx to select specific domain, and I would like to share for whoever is interested Modify the Login.ascx as show below:

<code>

<%@ Control Language="vb" Inherits="DotNetNuke.Authentication.ActiveDirectory.Login, DotNetNuke.Authentication.ActiveDirectory" AutoEventWireup="false" Explicit="True" CodeBehind="Login.ascx.vb" %>
<%@ Register TagPrefix="dnn" Assembly="DotNetNuke" Namespace="DotNetNuke.UI.WebControls" %>
<%@ Register TagPrefix="dnn" TagName="Label" Src="~/controls/LabelControl.ascx" %>

<script type="text/jscript">
function checkInput(usrname_value, password_value, cboDomain_index) {
var Proceed = 1;
var Message;

while (Proceed == 1) {
if (!usrname_value) {
Message = "Please enter Username.";
Proceed = 0;
break;
}
if (!password_value) {
Message = "Please enter Password.";
Proceed = 0;
break;
}
if (cboDomain_index == 0) {
Message = "Please select Domain.";
Proceed = 0;
break;
}

break;
}

if (Proceed == 1) {
return true;
}
else {
Message = "";
return false;
}
}

function validateLogin() {
var username = document.getElementById('<%= txtUsername.ClientID %>');
var btn = document.getElementById("<%= cmdLogin.ClientID %>");
var password = document.getElementById('<%= txtPassword.ClientID %>');
var cboDomain = document.getElementById('<%= cboDomain.ClientID %>');
var usrname = document.getElementById('txtUsrname');

if (checkInput(usrname.value, password.value, cboDomain.selectedIndex)) {
username.value = cboDomain.options[cboDomain.selectedIndex].value + "\\" + usrname.value;
btn.click();
}
}
</script>

<table cellspacing="0" cellpadding="3" border="0" summary="SignIn Design Table" width="160">
<tr>
<td colspan="2" class="SubHead" align="left"><dnn:label id="plUsername" controlname="txtUsername" runat="server" text="UserName:" /></td>
</tr>
<tr>
<td colspan="2" align="left"><input type="text" id="txtUsrname" class="NormalTextBox" /></td>
</tr>
<tr>
<td colspan="2" class="SubHead" align="left"><dnn:label id="plPassword" controlname="txtPassword" runat="server" text="Password:" /></td>
</tr>
<tr>
<td colspan="2" align="left"><asp:TextBox ID="txtPassword" Columns="9" Width="130" TextMode="password" CssClass="NormalTextBox" runat="server" /></td>
</tr>
<tr>
<td colspan="2" class="SubHead" align="left"><dnn:label id="plDomain" controlname="auth" runat="server" text="Domain:" /></td>
</tr>
<tr>
<td colspan="2" align="left">
<asp:DropDownList ID="cboDomain" runat="server" class="NormalTextBox">
<asp:ListItem Value="">- Please Select -</asp:ListItem>
<asp:ListItem Value="joint">Joint</asp:ListItem>
<asp:ListItem Value="water">Water</asp:ListItem>
<asp:ListItem Value="power">Power</asp:ListItem>
</asp:DropDownList>
</td>
</tr>
<tr id="trCaptcha1" runat="server">
<td colspan="2" class="SubHead" align="center"><dnn:label id="plCaptcha" controlname="ctlCaptcha" runat="server" text="Password:" /></td>
</tr>
<tr id="trCaptcha2" runat="server">
<td colspan="2" align="center"><dnn:captchacontrol id="ctlCaptcha" captchawidth="130" captchaheight="40" cssclass="Normal" runat="server" errorstyle-cssclass="NormalRed" /></td>
</tr>
<tr>
<td colspan="2" id="tdLogin" runat="server" align="left">
<asp:Button ID="cmdLogin" Style="visibility: hidden;" runat="server" />
<input id="cmdLgin" type="button" value="Login" class="StandardButton" onclick="validateLogin();" />
<asp:TextBox ID="txtUsername" Style="visibility: hidden;" runat="server" />
</td>
</tr>
</table>

</code>

Modify/Insert the Login.ascx.resx as show below:

modify plUsername.Help -> Enter your User Name below

insert plDomain.Text -> Domain:

insert plDomain.Help -> Select your Domain below

I hope it helps.