INFO: Default DCOM Impersonation Level Changed in Windows Management Instrumentation Version 1.5 (243488)

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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:

Set classObj = GetObject("WinMgmts:{impersonationLevel=impersonate}!//./root/cimv2:Win32_logicalDisk")
For Each obj In classObj.instances_
    ' Process this instance
Next
				

This step is no longer necessary. For example:

Set classObj = GetObject("WinMgmts://./root/cimv2:Win32_logicalDisk")
For Each obj In classObj.instances_
    ' Process this instance
Next
				

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.