jQuery Validation Engine Confirm Password Validation not working when using Master Page in ASP.Net

Since you are using Master and Content Pages the ID of the TextBox changes and hence the following won't work as it is not able to find the TextBox.

<asp:TextBox runat="server" TextMode="Password" ID="txtConfmPasswd" MaxLength="20" CssClass="validate[required,equals[txtPasswd]]"></asp:TextBox>

Thus the only way to solve this issue is setting the CssClass from code behind so that we can pass the ClientID of the other TextBox

txtConfmPasswd.CssClass = "validate[required,equals[" + txtPasswd.ClientID + "]]";