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In Microsoft Windows Management Instrumentation version 1.5, the default DCOM impersonation level is RPC_C_IMP_LEVEL_IMPERSONATE. In earlier versions of WMI, the default level was RPC_C_IMP_LEVEL_IDENTIFY.
In WMI 1.1, you had to explicitly set the DCOM impersonation level to RPC_C_IMP_LEVEL_IMPERSONATE. For example, the following Microsoft Visual Basic code explicitly sets the impersonation level:
This step is no longer necessary. For example:
In WMI 1.1, the classObj.instances_ call would fail with error code 0x80041003 (WBEM_E_ACCESS_DENIED) because the provider needs to impersonate the client in order to access system information. Because WMI 1.5 impersonates the client by default, the code would succeed. However, you may still want to explicitly set the impersonation level in order to maintain compatibility with previous versions of WMI.
See the WMI programming documentation in the Platform SDK for more details.