Some hits are trying to workaround some of the extensions to a Web site. So, I receive hits with the axd extension such as:

WebResource.axd?d=SZEFqug8p8L5B-9RjR3GVw2&t=63294346530265625

To intercept that and to avoid this log in the Event Viewer, I have added this in my Global.asax:

    Sub Application_PreRequestHandlerExecute(ByVal sender As Object, ByVal e As EventArgs)
        Dim loContext As Object = Context.Handler
        Dim loType As Object = loContext.GetType()
        Dim lcType As String = loType.ToString

        ' .axd
        If lcType = "System.Web.Handlers.AssemblyResourceLoader" Then
            Response.Redirect("Default.aspx")
        End If

    End Sub

My Global.asax includes more lines. I just kept the relevant ones here for this issue. So far, this works. So, basically, if a robot tries to send several URL like this, they will be forwarded to the main page. Having this like that, can this be the cause of potential other problems that could be related to that? Or, basically, what does the axd extension exactly?