This collection already contains an address with scheme http

When using EPiServer Community (relate+) on a site with several configured host header names the search stops working.

When trying to reach the search service through the browser (http://{my site}/IndexingService/IndexingService.svc/) I get the  "This collection already contains an address with scheme http" error

I fixed this issue by adding multipleSiteBindingsEnabled="true" to the serviceHostingEnvironment tag in web.config (it's locatated in the serviceModel tag)

<serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" >