HTTP Error 500.19 – Internal Server Error with ASP.NET web on Windows 8 and IIS 8

I’m blogging this (again*) so next time I do a search I find my own post, it may also help you. I manage a few development VMs which I swear I have setup in the past correctly, but every so often I find one that’s got the following problem.

*Again: it’s in an older post in the trouble shooting part, but this time, the error is the title of the post to help indexing, as when I searched this time around, that post did not come up.

Scenario / Error

Windows 8 + IIS launching your ASP.NET web app, you get the following IIS error:

HTTP Error 500.19 – Internal Server Error
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”.

Note the ‘locked at a parent level’, in the config error.


Turn on the Application Development Features. If they’re already on, then you have a different problem, there’s a few questions about ASP.NET IIS and 500.19 on Stack Overflow.

Enable IIS 8 App Dev Features

Hope this helps.

Cross subdomain ASP.NET Forms Authentication for local developement

I’ve had this issue twice now, and both times when I did my search I would end up this popular Stack Overflow question but adding an answer to a popular question that doesn’t directly* answer the question will get the attention of down vote police.

*For some values of direct.

So I’ll just have to blog it here, and maybe the comment will help someone out who is likely to end up on that question, at least until the comment is flagged as unconstructive or offensive because “somewhat related” isn’t in the spirit of StackOverflow.

So with the grievance aired.


To be able to have subdomain1.machine-name and subdomain2.machine-name share a cookie locally via forms authentication.


To go about achieving the saving of an authentication cookie valid across multiple domains locally under IIS.


The most important thing here is to ensure that your local domain has at least ‘.’ in it. I often try to just have it be the machine name, this does not work, so I select something like the .app suffix.

Authentication configuration section in web.config:

   <authentication mode="Forms">
      <forms loginUrl="~/login" timeout="2880" domain="" />

IIS Setup

Will look like this:

iis settings


hosts file


There we go, with this set up you can go to red. and blue. and have it share the authentication cookie to be logged into your app across sub domains locally.

dashbaord blue


I also ran into some extra issues on Windows 8 similar to this StackOverflow question.

Exception from IIS:

HTTP Error 500.19 – Internal Server Error

The requested page cannon be access because the related configuration data for this page is invalid.

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.

To solve this you need to probably enable some Windows Features related to Security and .NET.

features toggle pointing

Automating IIS actions with PowerShell – Create Multiple Sites

I’m working towards a more complex SignalR based post, but in the mean time part of the work on that involves setting up a few ASP.NET web apps.

If you’re after a more comprehensive guide check out this post on by Thomas Deml. I’ve summarised the steps required to get some basic .NET 4 web applications deployed.

To create N identical websites in local IIS, each with an incrementing name Id. Each linked to the same application directory. The exact reason as to why will come in a future post, for now consider it an exercise in manipulating IIS via PowerShell.

Step 1 – Ensure you’re running the scripts in x86 mode.

Which seems quite common a problem, with a stackoverflow question. I haven’t worked a way around this yet, but this is the error when not running as x86:

New-Item : Cannot retrieve the dynamic parameters for the cmdlet. Retrieving the COM class factory for component with CLSID {688EEEE5-6A7E-422F-B2E1-6AF00DC944A6} failed due to the following error: 80040154.
At line:1 char:9
+ New-Item <<<< AppPools\test-app-pool
+ CategoryInfo : InvalidArgument: (:) [New-Item], ParameterBindingException
+ FullyQualifiedErrorId : GetDynamicParametersException,Microsoft.PowerShell.Commands.NewItemCommand

Step 2 – Import-Module WebAdministration
This loads the IIS namespace which allows you to just navigate in the same way you would the filesystem

> CD IIS:\

Step 3 – Create & Configure App Pool

    New-Item AppPools\test.pool

    Set-ItemProperty IIS:\AppPools\test.pool -name "enable32BitAppOnWin64" -Value "true"

    Set-ItemProperty IIS:\AppPools\test.pool -name "managedRuntimeVersion" -Value "v4.0"

NOTE: here I didn’t have any luck storing the app pool path in a variable then using Set-ItemProperty, hence the repeating.

Step 4 – Variables

    $sitesToCreate = 10
    $path = "C:\dev\project-x\App.Web"
    $appPool = "test.pool"

Step 5 – Create Site & Link AppPool Loop

For N(10) to zero:

  • Create a new site
  • Set binding info and physical path
  • Set the app pool
    while ($sitesToCreate -gt 0)
        $siteName = "s" + $sitesToCreate + ".site.local"
        $siteWithIISPrefix = "IIS:\Sites\" + $siteName
        Write-Host "Creating: " $siteName
        $site = New-Item $siteWithIISPrefix -bindings @{protocol="http";bindingInformation="*:80:" + $siteName } -physicalPath $path
        Set-ItemProperty IIS:\Sites\$siteName -name applicationPool -value $appPool

Note: ‘appPool’ is a text variable, not the ‘Get-Item’. Set-ItemProperty operates on a path not a variable representing the item.

We’re done

One last note, to get these to resolve correctly on your local developer machine you’ll need to modify your hosts file.

IIS multisite

The complete code up as a Github Gist.