WMI query returns no result C++ - c++

Question

I'm connecting to Windows server 2012 and 2008 R2 from a Windows 7 machines.
My code is working in some computers but in some computers when I run my app query always return NULL.
When I execute Next method on IEnumWbemClassObject object it returns error code x80041003.
I'm trying to query Win32_Process class
My Code:
hres = CoInitializeEx( 0, COINIT_MULTITHREADED );
hres = CoInitializeSecurity(
NULL,
-1, // COM authentication
NULL, // Authentication services
NULL, // Reserved
RPC_C_AUTHN_LEVEL_CONNECT, // Default authentication
RPC_C_IMP_LEVEL_IMPERSONATE, // Default Impersonation
NULL, // Authentication info
EOAC_NONE, // Additional capabilities
0 // Reserved
);
hres = CoCreateInstance(
CLSID_WbemLocator,
0,
CLSCTX_INPROC_SERVER,
IID_IWbemLocator, (LPVOID *) &pLoc);
hres = pLoc->ConnectServer( ServerName,Username, Password, NULL, WBEM_FLAG_CONNECT_USE_MAX_WAIT, NULL, NULL, &pSvc);
COAUTHIDENTITY AuthId;
memset(&AuthId, 0, sizeof(COAUTHIDENTITY));
//Initialized AuthId
hres = CoSetProxyBlanket(
pSvc, // Indicates the proxy to set
RPC_C_AUTHN_WINNT, // RPC_C_AUTHN_xxx
RPC_C_AUTHZ_DEFAULT, // RPC_C_AUTHZ_xxx
NULL, // Server principal name
RPC_C_AUTHN_LEVEL_CALL, // RPC_C_AUTHN_LEVEL_xxx
RPC_C_IMP_LEVEL_IMPERSONATE, // RPC_C_IMP_LEVEL_xxx
&AuthId, // client identity
EOAC_NONE
);
Query.Format( _T( "SELECT * FROM Win32_Process WHERE Name like '%s.exe'" ), App.Name );
IEnumWbemClassObject* pEnumerator = NULL;
hr = App.Server.pSvc->ExecQuery(
L"WQL",
Query.AllocSysString(),
WBEM_FLAG_RETURN_IMMEDIATELY,
NULL,
&pEnumerator
);
hr = pEnumerator->Next(WBEM_INFINITE, 1, &pclsObj, &uReturn);