Enable authentication for IIS app in Powershell

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I had the issue of dealing with locked sections and the accepted answer proposes opening up a GUI to solve it, which I am trying to avoid with PowerShell in first place.

Short Answer

Enable Windows Authentication and Disable Anonymous Authentication

$iisSiteName = "Default Web Site"
$iisAppName = "MyApp"

Write-Host Disable anonymous authentication
Set-WebConfigurationProperty -Filter '/system.webServer/security/authentication/anonymousAuthentication' -Name 'enabled' -Value 'false' -PSPath 'IIS:\' -Location "$iisSiteName/$iisAppName"

Write-Host Enable windows authentication
Set-WebConfigurationProperty -Filter '/system.webServer/security/authentication/windowsAuthentication' -Name 'enabled' -Value 'true' -PSPath 'IIS:\' -Location "$iisSiteName/$iisAppName"

Dealing with Locked Sections

As noted in the IIS documentation:

Authentication sections are usually locked, i.e. they can’t be written
to a web.config file but have to be written to the central
applicationhost.config file instead.

We have to use -PSPath and -Location parameters.

Set-WebConfigurationProperty -filter /system.webServer/security/authentication/windowsAuthentication -name enabled -value true -PSPath IIS:\ -location DemoSite/DemoApp

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)