The requested page cannot be accessed because the related configuration data for the page is invalid

Problem

When trying to consume a web service deployed to IIS, the following error is displayed:

Description: The requested page cannot be accessed because the related configuration data for the page is invalid.

Error Code: 0x80070021

Config Error: This configuration section cannot be used at this path. This happens when the section is locked at a parent level. Locking is either by default (overrideModeDefault="Deny"), or set explicitly by a location tag with overrideMode="Deny" or the legacy allowOverride="false".

 

Then is complains about the <handlers> section in the web.config file.

 

Solution

http://forums.asp.net/p/1220987/2178061.aspx

 

To correct error I changed the following values located in the applicationHost.config file located in Windows\system32\inetsrv.

Change all of the following values located in section <configSections> –> <sectionGroup name="system.webServer">

<section name="handlers" overrideModeDefault="Deny" /> change this value from "Deny" to "Allow"

If you see any errors such as

 

Handler XXX has a bad module "ManagedPipelineHandler" in its module list

 

ensure you have ASP.NET properly installed (aspnet_regiis -i). Finally, ensure your app folder is a web app in IIS (not only a regular folder).

 

BR,

— AFurtado