After running WCF on my Vista laptop (IIS7) I needed to deploy the application on some Windows XP computers. Again some strange errors occurred:

[code:html]

Error Description: "This collection already contains an address with scheme http.  There can be at most one address per scheme in this collection.
Parameter name: item"

[/code]

The problem is that WCF cannot handle more than one identity (host headers) per website. At first I configured IIS to have one HostHeader. That solution was just to dirty. So I kept on searching the internet.

You can fix this problem by adding prefix-key(s) in the baseAddressPrefixFilters section of the Web.Config:

[code:xml]
<system.serviceModel>
<serviceHostingEnvironment>
<baseAddressPrefixFilters>
        <add prefix=”http://www.local.develop”/>

</baseAddressPrefixFilters>
</serviceHostingEnvironment>
</system.serviceModel>
[/code]

Hope this helps.

Sources:
http://geekswithblogs.net/robz/archive/2007/10/02/WCF-in-IIS-with-Websites-that-have-Multiple-Identities.aspx
http://blogs.msdn.com/rampo/archive/2008/02/11/how-can-wcf-support-multiple-iis-binding-specified-per-site.aspx

Author: Pieter Brinkman (123 Posts)

Pieter is Technical Marketing Manager for Sitecore Netherlands and owner of Gaatverweg.nl. He has more than ten years experience with software developing in multiple programming languages and with different Content Management Systems. Before joining Sitecore Pieter was a lead developer for multiple Sitecore and .Net projects, he joined Sitecore in 2011 as an Solution Architect in The Netherlands, after two years as an Solution Architect he joined the Technical Marketing department. In the role as Techinical Marketing Manager he is responsible for the Global MVP program and the Sitecore technical branding strategy. You can follow Pieter on twitter: @pieterbrink123 or Google+

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