Solved: yes


Under the management of the IIS Manager Web site administration, the handler mapping setting can not be opened.

If you want to open Website-> Administrative Tools-> Handler Mappings, then comes the message


Error while performing this operation

This configuration section can not be used in this path.

This is the case if the section is locked at higher levels.

The blocking is done by default

(OverrideModeDefault defaults = Deny)

or becomes explicit with a

location tag with overrideMode = Deny

or the

Legacy setting allowOverride = false


System configuration:

Internet Information Services IIS10, Windows Server 2016, Booth 2018

IIS Manager

IIS Error: Handler mappings


In the browser of the website

This means that when opening the website the same error with code 0x80070021 gets displayed

HTTP Error 500.19 - Internal Server Error

The requested page can not be accessed because the associated page configuration information is invalid.

Error code 0x80070021

  This configuration section can not be used in this path. This is the case if the section is locked at a higher level. The lock is done by default (overrideModeDefault = "Deny") or is explicitly set with a location tag with overrideMode = "Deny" or the legacy setting allowOverride = "false".

IIS Error: Handler mappings




Under the Server Manager-> Server Roles-> Web Server IIS

In the sub-item: Application development activate all options (except cgi and the old asp without .net)

IIS Error: Handler mappings




After the extension of the IIS features comes another error.

This means that the original problem was solved

IIS Error: Handler mappings


Subsequent error:

HTTP Error 500.24 - Internal Server Error


An ASP.NET setting was detected that is not valid in managed pipe mode "built-in".

Most likely causes:

• system.web/identity@impersonate is set to true.


Possible procedure:

• If the application supports it, disable client impersonation.

• If you are sure that this error can be ignored, disable the feature by setting system.webServer/validation@validateIntegratedModeConfiguration to false.

• Move this application to an application pool using classic .NET mode. Example:% SystemRoot% \ system32 \ inetsrv \ appcmd set app "Default Web Site /" / applicationPool: "Classic .NET AppPool"

(You can set Classic .NET AppPool to the name of another application pool that runs in classic, managed pipelined mode.)


Detailed error information:

Module ConfigurationValidationModule

Notification BeginRequest

Handler ExtensionlessUrlHandler-Integrated-4.0

Error code 0x80070032

Requested URL

Physical path C: \ _ Data \ _web \ Readdy

Registration method Still undetermined

User Login Still

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