title: Intermittent WCF error: Collection already contains an address with scheme http
body: <p>I get this intermittent WCF error:</p>
  
  <p>This collection already contains an address with scheme http.  There can be at most one address per scheme in this collection.
  Parameter name: item</p>
  
  <p>I tried various solutions by from googling around and from stackoverflow and they work for a while until the error shows up again and then I attempt another solution.  It is really frustrating.  Right now this is all voodoo to me as I don't understand why this is happening.  It appears that if I touch the webconfig file and save it, the error disappears.   I don't know if this causes it, but my webconfig is nested in that it lives under a special webservices folder.  Any suggestions?</p>