WMI fails locally, works fine remotely. Why?

My web service, running as Network Service, uses the WMI COM API to modify a
class instance. When working locally, it fails with 'Access Denied' errors,
but works fine remotely.

I use CoSetProxyBlanket() on my IWbemServices object to set up impersonation
of a local administrator. It seems that these settings are being utilized
correctly when connecting to a remote machine, but are ignored when local.

If I change the web service's identity from Network Service to Local System,
everything works fine. However, I don't want to have to do this.

How can I force the use of the security settings specified by
CoSetProxyBlanket()? Failing that, are there any alternatives to just
changing the Network Service to Local System?
.

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