Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server."

Question

I have couple of update panels and jquery tabs on page. And also I am loading couple user controls on update panels. After user waited for couple of minutes (not checked the

Answer 1

@JS5 , I also faced the same issue as you: ImageButton causing exceptions inside UpdatePanel only on production server and IE. After some research I found this:

There is an issue with ImageButtons and UpdatePanels. The update to .NET 4.5 is fixed there. It has something to do with Microsoft changed the x,y axis of a button click from Int to Double so you can tell where on the button you clicked and it's throwing a conversion error.

Source

I'm using NetFramework 2.0 and IIS 6, so, the suggested solution was to downgrade IE compatibility adding a meta tag:

I've done this via Page_Load method only on the page I needed to:

Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
    Dim tag As HtmlMeta = New HtmlMeta()

    tag.HttpEquiv = "X-UA-Compatible"
    tag.Content = "IE=9"

    Header.Controls.Add(tag)
End Sub

Hope this helps someone.