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ASP.NET MVC application hangs on presentation Close in IIS

Hello, I have an ASP.NET MVC 4 application on a Windows Server 2016 IIS with presentation exporting based on a .potx template file.


When I export the presentation with this code:

private ActionResult SendResponse(string fileName, HttpResponse response)

{

            //Save the PowerPoint Presentation

            Ppt.Save(fileName, FormatType.Pptx, response);


            //Close the PowerPoint presentation

            Ppt.Close();


            return new EmptyResult();

}



The code executes well but the server hangs when doing Ppt.Close() with high CPU and the only way to stop it is by killing the w3wp process for the site.


I open the .potx file in this way:

private void OpenPresentationFromTemplate()

{

            var templateUrl = GetTemplateUrl();


            //Create a new instance of PowerPoint Presentation file

            Ppt = Presentation.Open(HttpContext.Current.Server.MapPath(templateUrl));

}


Thank you