Ajax Sys.WebForms.PageRequestManagerServerErrorException

Question

A little background. I have a IIS8 server. Lets call this server ABC. In server ABC. I have two website. One is called websiteA and websiteB. they are identical website. Only subtle differences since websiteB is primary used for test and dev purpose.

Can you please help me to troubleshoot the issue on WebsiteA? The error is a generic error:

Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 500

This error does not happen in WebsiteB. and I have compared the ASPX page to make sure they are exactly the same.

Can you help me how to troubleshoot the error 500 on the server? I don't know how...

This is the register Assembly for the ajax on top of the ASPX page:

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>

This is the snippet for my toolkit

<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server" EnablePageMethods="True"></asp:ToolkitScriptManager>

score 1 · Accepted Answer · edited May 23 '17 at 11:52

Wow. I fixed this. So for kicks I start removing stuff from the page. The first one I remove was this bit. because in less than 1 year ago I added this bit.

         <asp:UpdatePanel ID="UpdatePanel1" runat="server">
                <ContentTemplate>
                </ContentTemplate>
            </asp:UpdatePanel>

Then I get a different error message: I get this error now:

System.Web.HttpException: Maximum request length exceeded

Did some google of that error and boom! I get this stackoverflow link: Maximum request length exceeded. I follow the suggestion and my problem goes away! Horray

and the solution is to add this in my web.config! (the one in bold is the new stuff I added)

System.webserver is the new bit

and

executionTimeout="100000" maxRequestLength="214748364"

<configuration>
  <system.web>
    <compilation debug="true" strict="false" explicit="true" targetFramework="4.5" />
    <httpRuntime targetFramework="4.5" executionTimeout="100000" maxRequestLength="214748364"  />
    <customErrors mode="Off"/>
  </system.web>
  <system.webServer>
    <security>
      <requestFiltering>
        <requestLimits maxAllowedContentLength="1073741824" />
      </requestFiltering>
    </security>
  </system.webServer>
</configuration>

Ajax Sys.WebForms.PageRequestManagerServerErrorException

1 Answers1