This article was previously published under Q197781
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If you call CoCopyProxy API on a proxy for a custom (automation) interfacethat is marshalled by the automation marshaller (Oleaut32.dll), the APIwill return the following error:
However, no copy will be made.
If you build a proxy/stub .dll for the same interface and use it as themarshaller, the API CoCopyProxy() works.
The old code had the assumption that CreateProxy returned a valid interfaceparameter, which is not TRUE for automation proxies. Automation proxiesreturn the interface pointer only after the channel is connected.
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
152734 How to Obtain the Latest Windows NT 4.0 Service Pack
Microsoft has confirmed that this is a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.