IIS complaining about Identity Impersonation using LDAP Authentication

c# asp.net authentication .net-4.0 ldap
Jerry Dodge picture Jerry Dodge · Dec 10, 2012 · Viewed 29k times · Source

I followed a tutorial to implement LDAP authentication in an ASP.NET/C# 4.0 web application. I did so in Visual Studio 2010. The site runs fine in debug mode through Visual Studio, but when I publish this site in IIS7, it is failing with the following error:

HTTP Error 500.24 - Internal Server Error An ASP.NET setting has been detected that does not apply in Integrated managed pipeline mode.

Most likely causes:

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

In fact, part of the tutorial required that I add this to the config file...

<identity impersonate="true"/>

So why would I be getting this error and how do I fix it?

Answer

Darren Wainwright picture Darren Wainwright · Dec 10, 2012

Try changing your application pool's pipeline mode to 'Classic'

You do this by opening IIS -> Application Pools -> Right-click your application pool and select Basic Settings -> Managed pipline mode, change to Classic

Restart your app pool and site (shouldn't need to but never hurts to try) and try again.

Another thing you can try, instead of the above, is to put the following in your web.config file, inside the <system.webServer> node:

       <validation validateIntegratedModeConfiguration="false" />

Related questions

how to generate a unique token which expires after 24 hours?

I have a WCF Webservice which checks if the user is valid. If the user is valid I want to generate a token which expires after 24 hours. public bool authenticateUserManual(string userName, string password,string language,string token) { if (Membership.…

Read More
Custom Authentication in ASP.Net-Core

I am working on a web app that needs to integrate with an existing user database. I would still like to use the [Authorize] attributes, but I don't want to use the Identity framework. If I did want to use …

Read More
ASP.NET Core Web API Authentication

I'm struggling with how to set up authentication in my web service. The service is build with the ASP.NET Core web api. All my clients (WPF applications) should use the same credentials to call the web service operations. After …

Read More