Section is locked (ipSecurity configuration)

Module IpRestrictionModule
Notification BeginRequest
Handler ExtensionlessUrl-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”.

Update file: applicationhost.config (%userprofile%\documents\iisexpress\config\applicationhost.config)

Change line:
<section name=”ipSecurity” overrideModeDefault=”Deny” />

<section name=”ipSecurity” overrideModeDefault=”Allow” />

And in web.config use:

<ipSecurity allowUnlisted=”false” denyAction=”Unauthorized”>
<add ipAddress=”X.X.X.X” allowed=”true” subnetMask=”″ />

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