Index: win32_api.hpp
===================================================================
--- win32_api.hpp	(revision 73272)
+++ win32_api.hpp	(working copy)
@@ -160,7 +160,10 @@
 static unsigned long key_query_value    = 0x0001;
 
 //COM API
+const long RPC_C_AUTHZ_NONE_IG = 0;
+const long RPC_C_AUTHN_LEVEL_CALL_IG = 3;
 const long RPC_C_AUTHN_LEVEL_PKT_IG = 4;
+const long RPC_C_AUTHN_WINNT_IG = 10;
 const long RPC_C_IMP_LEVEL_IMPERSONATE_IG = 3;
 const long EOAC_NONE_IG = 0;
 const long CLSCTX_INPROC_SERVER_IG   = 0x1;
@@ -858,9 +861,18 @@
 extern "C" __declspec(dllimport) long __stdcall CoCreateInstance(const GUID_IG & rclsid, IUnknown_IG *pUnkOuter,
                     unsigned long dwClsContext, const GUID_IG & riid, void** ppv);
 extern "C" __declspec(dllimport) void __stdcall CoUninitialize(void);
+extern "C" __declspec(dllimport) long __stdcall CoSetProxyBlanket(
+													IUnknown_IG *pProxy,
+													DWORD dwAuthnSvc,
+													DWORD dwAuthzSvc,
+													OLECHAR *pServerPrincName,
+													DWORD dwAuthnLevel,
+													DWORD dwImpLevel,
+													RPC_AUTH_IDENTITY_HANDLE pAuthInfo,
+													DWORD dwCapabilities
+													);
 
 
-
 //API function typedefs
 //Pointer to functions
 typedef long (__stdcall *NtDeleteFile_t)(object_attributes_t *ObjectAttributes); 
@@ -1516,6 +1528,21 @@
 
       com_releaser<IWbemServices_IG> IWbemServices_releaser(pWbemServices);
 
+			// addition to fix ticket #5392
+			// @see http://support.microsoft.com/kb/948829
+			// @see http://msdn.microsoft.com/en-us/library/ms692692%28v=vs.85%29.aspx			
+			// ignoring the return value, because the following lines may work anyway
+			CoSetProxyBlanket(
+				pWbemServices,                  // Indicates the proxy to set
+				RPC_C_AUTHN_WINNT_IG,						// RPC_C_AUTHN_xxx
+				RPC_C_AUTHZ_NONE_IG,						// RPC_C_AUTHZ_xxx
+				NULL,														// Server principal name
+				RPC_C_AUTHN_LEVEL_CALL_IG,			// RPC_C_AUTHN_LEVEL_xxx
+				RPC_C_IMP_LEVEL_IMPERSONATE_IG, // RPC_C_IMP_LEVEL_xxx
+				NULL,														// client identity
+				EOAC_NONE_IG										// proxy capabilities
+				);
+
       strValue.clear();
       strValue += L"Select ";
       strValue += wmi_class_var;