Do you have generic exception handler in your Global.asax?
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Add your code to handle generic exception of your ASP.NET application in Application_Error.
private static readonly ILog log = LogManager.GetLogger(typeof(MvcApplication));protected void Application_Error(object sender, EventArgs e){Exception ex = Server.GetLastError().GetBaseException();log.Fatal("Unhandled Exception", ex);}
Figure. Exception handler in Global.asax.cs