WebResource.asd giving 403 error in ASP.Net Post backs using IIS7

Question

I installed a ASP.Net website on a Windows 2008 server, which is by default using IIS7. The website seems to work fine, but the post backs on my forms do not work. After a few hours of debugging, I realized that when I manually try to hit the WebResource.axd file in my browser (e.g. I type http://www.domain.com/WebResource.axd in the address bar), I get a HTTP 403 error (Access Denied).

I'm not quite sure where to look next and my Windows 2008 security knowledge is limited. How do I go about giving access to that file?

Answer 1

Check your IIS logs - they should give a status code that has more detailed information about the error. Also, what is the nature of the error on the postback?

Answer 2

This is the error that I'm getting when doing a Postback:

WebForm_PostBackOptions is undefined.

To my knowledge that function is contained inside the WebResource.axd file, which led me to try it in the address bar, which how I know about the 403 error...

Answer 3

Not sure on that one, but it may be related to http compression in IIS. Also check that the file is accessible to the IIS User.

Answer 4

Navigate to your iis config folder. Typically: c:\windows\system32\inetsrv\config and open applicationHost.config file. Then within file navigate to the <handlers> section and check that following line is present:

<add name="AssemblyResourceLoader-Integrated" path="WebResource.axd" verb="GET,DEBUG" type="System.Web.Handlers.AssemblyResourceLoader" preCondition="integratedMode" />

That is if you're running in integrated mode. Check that verb GET is specified.

If you are running in classic pipeline mode that this line should be present

<add name="AXD-ISAPI-2.0" path="*.axd" verb="GET,HEAD,POST,DEBUG" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v2.0.50727\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv2.0,bitness32" responseBufferLimit="0" />

If everything seems to be ok than look at your web.config in Handlers and Modules section and see if you have added <clear /> on the top of each. If you did then you have include add section in your web.config file respecting the order in of the handlers/modules specified in applicationHosting.config file.

Answer 5

Hi

Have you solved this issue? I am getting the same issue in MOSS 2007 and I have no idea how to solve this. Been searching for days now!