IIS ASP.Net Website - ManagedPipelineHandler Error ( An operation was attempted on a nonexistent network connection)
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
<telerik:RadFormDecorator ID="RadFormDecorator" runat="server" DecoratedControls="All" />
<p>
    Please enter your username and password.
</p>
<asp:Login ID="LoginUser" runat="server" EnableViewState="false" RenderOuterTable="false">
    <LayoutTemplate>
        <asp:Panel runat="server" ID="LoginPanel" DefaultButton="LoginButton">
            <p>
                <span class="failure-notification">
                    <asp:Literal ID="FailureText" runat="server"></asp:Literal>
                </span>
            </p>
            <asp:ValidationSummary ID="LoginUserValidationSummary" runat="server" CssClass="failure-notification"
                ValidationGroup="LoginUserValidationGroup" />
            <div class="account-info">
                <fieldset class="login">
                    <legend>Account Information</legend>
                    <p>
                        <asp:Label ID="UserNameLabel" runat="server" AssociatedControlID="UserName">Username:</asp:Label>
                        <asp:TextBox ID="UserName" runat="server" CssClass="text-entry"></asp:TextBox>
                        <asp:RequiredFieldValidator ID="UserNameRequired" runat="server" ControlToValidate="UserName"
                            CssClass="failure-notification" ErrorMessage="User Name is required." ToolTip="User Name is required."
                            ValidationGroup="LoginUserValidationGroup">*</asp:RequiredFieldValidator>
                    </p>
                    <p>
                        <asp:Label ID="PasswordLabel" runat="server" AssociatedControlID="Password">Password:</asp:Label>
                        <asp:TextBox ID="Password" runat="server" CssClass="password-entry" TextMode="Password"></asp:TextBox>
                        <asp:RequiredFieldValidator ID="PasswordRequired" runat="server" ControlToValidate="Password"
                            CssClass="failure-notification" ErrorMessage="Password is required." ToolTip="Password is required."
                            ValidationGroup="LoginUserValidationGroup">*</asp:RequiredFieldValidator>
                    </p>
                    <%--<p>
                        <asp:CheckBox ID="RememberMe" runat="server"/>
                    <asp:Label ID="RememberMeLabel" runat="server" AssociatedControlID="RememberMe" CssClass="inline">Keep me logged in</asp:Label>
                    </p>--%>
                </fieldset>
                <p class="margin-top-10">
                    <asp:Button ID="LoginButton" runat="server" CommandName="Login" Text="Log In" ValidationGroup="LoginUserValidationGroup" />
                </p>
            </div>
        </asp:Panel>
    </LayoutTemplate>
</asp:Login>