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E_ACCESSDENIED exception when attaching to an event in a COM server from .NET

I have a C++/ATL COM server that implements IConnectionPoint events. My client is a C# application that attaches to the events. When the COM server is created as a SYSTEM service, the client can properly attach to the event. When the COM server is created as a LocalService service (preferred), then I get an E_ACCESSDENIED exception when I attach to the event.

What can I do to get the events to work when the COM server is LocalService?

Thanks.

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