ASP.Net AjaxToolKit Timer control Tick event is not triggered intermittently in windows 2019

ASP.Net AjaxToolKit Timer control Tick event is not triggered intermittently

We are using  asp:Timer while loading Excel Documents, The OnTick event of the Timer control is not getting fired intermittently. This was working fine earlier but causing the issue after upgrading the web server to 2019

Below are our old and new environment details:

Below is the code snippet: Here HideExcelProgress_Tick event is not getting triggered intermittently . Also tried changing the Ajax tool kit optionCombineScripts="False” but that did not help.

<asp:Timer runat="server" ID="ExcelUpdateTimer" Interval="1000" OnTick="HideExcelProgress_Tick" Enabled="false" />

    <asp:UpdatePanel ID="updatePanelExcel" runat="server" UpdateMode="Always">

    <Triggers><asp:AsyncPostBackTrigger ControlID="ExcelUpdateTimer" EventName="Tick" /></Triggers>

    <ContentTemplate>

      <div id="divExcel" runat="server" style="width: 100%; height: 100%; background-color: White; filter: alpha(opacity=50); opacity: 0.5; z-index: 10; position: absolute; left: 0px; top: 0px; display: none;"> </div>

             <div id="divSubExcel" runat="server" style="border: 1px solid gray; width: 250px; position: absolute; left: 450px; top: 350px; background: White; z-index: 11; padding: 5px; filter:    alpha(opacity=100); opacity: 1; display: none;" aria-labelledby="lblExcelProgress" tabindex="0">

                        <table cellpadding="0" cellspacing="0" border="0" width="100%">

                            <tr valign="top">

                                <td align="right" style="vertical-align: middle">

                                    <img src="Images/ProgressBar.gif" alt="" id="Img2" />&nbsp;

                                </td>

                                <td align="left" style="vertical-align: middle">

                                    <acesec:Label ID="lblExcelProgress" runat="server" Text=""></acesec:Label>

                                </td>

                            </tr>

                        </table>

                    </div>

   </ContentTemplate>

   </asp:UpdatePanel>

Any help is highly appreciated.

Thanks