In an XPM implementation, when saving or "updating preview" a call is made to http://CMSERVERURL/WebUI/Models/SiteEdit/Services/Services.svc/GetPreviewToken.

This call is not returning any response (of any kind, success, fail, not found) and I've not found anything interesting (Errors or Warnings) in the Preview OData web-service logs (on Debug mode)

The web-service seems to be working correctly, as requesting /session/ws/odata.svc/Components returns results

  • Have you installed and configured preview service which is required in addition to session service?
    – Hiren Kaku
    Commented Oct 11, 2016 at 18:32

1 Answer 1


This turned out to be a proxy / load balancer issue.

We now get tokens, but with very varied performance (10 seconds to 2 minutes), which appears to be based on the Component/Component Template combination and how broadly it is used/linked elsewhere


  • Component on one page - seconds
  • Component heavily linked/used on other pages - minutes

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