StackOverflow2013

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plurals

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19302369
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2013-10-10T17:28:59.947
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2013-10-10T17:28:59.947
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It seems likely you're a victim of the double-hop issue when using <a href="http://en.wikipedia.org/wiki/Integrated_Windows_Authentication" rel="nofollow">Integrated Windows Authentication</a> (IWA) and <a href="http://en.wikipedia.org/wiki/Kerberos_%28protocol%29" rel="nofollow">Kerberos</a>. The first hop is from your browser to the web application; the second hop is from your web application to the WCF service. Here are some resources that explain the issue more fully, and may offer a solution: <ul> <li><a href="http://weblogs.asp.net/owscott/archive/2008/08/22/iis-windows-authentication-and-the-double-hop-issue.aspx" rel="nofollow">IIS, Windows Authentication and the Double Hop issue</a></li> <li><a href="http://www.codeproject.com/Articles/266515/Using-Integrated-Windows-Authentication-IWA-in-a-D" rel="nofollow">Using Integrated Windows Authentication (IWA) in a Distributed Application Architecture</a></li> <li><a href="http://blogs.technet.com/b/askds/archive/2008/06/13/understanding-kerberos-double-hop.aspx" rel="nofollow">Understanding Kerberos Double Hop</a></li> </ul> You can configure Active Directory to support <a href="http://blogs.msdn.com/b/autz_auth_stuff/archive/2011/05/03/kerberos-delegation.aspx" rel="nofollow">Kerberos delegation</a> (usually the infrastructure guys don't like this), or you could turn off impersonation and use a "service" account for the web application and IIS app pool that can authenticate with the WCF service on behalf of the end user.
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1. PONot passing Credentials to WCF Service resulting in a 401
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1. USKit
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1. PONot passing Credentials to WCF Service resulting in a 401
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