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I receive this error on IIS 10

Module         AnonymousAuthenticationModule
Notification   AuthenticateRequest
Handler        ExtensionlessUrlHandler-Integrated-4.0
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".

How to allow overrideMode on IIS 10 Web.Config?

This recipe with applicationHost.config don't working https://docs.supportpal.com/current/Troubleshoot+IIS+Configuration+Option+Cannot+Be+Used

Feature Delegation from this from this topic Config Error: This configuration section cannot be used at this path is absent

Of course, all IIS future added, this site don't use ASP.NET, ASP only. I need only add allow overriding in root web config, how to do this?

Viacheslav Dev
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  • That's impossible as no one should be able to unlock sections from `web.config` (that will be a security black hole). – Lex Li Jun 04 '23 at 14:25
  • @LexLi, Why this is security black hole? For example whole site has anonymous AU, but in some site subfolder I want to delete anonymous AU. – Viacheslav Dev Jun 05 '23 at 07:41
  • Some configurations can only be configured in applicationhost. You can set **overrideModeDefault="Allow"** in of applicationhost.config. – TengFeiXie Jun 05 '23 at 07:45

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