Question

GetObject("winmgmts:\\.\root\cimv2")

Asked by: richelieu7777

More than one customer of mine is reporting a "Permission Denied" error number 70 when the following lines are executed:

  Dim objWMIService As Object
  Set objWMIService = GetObject("winmgmts:\\.\root\cimv2")

These two lines are called within the "Class_Initialize" function of a class in an ActiveX DLL of mine.

I cannot reproduce this error on any computer I can get my hands on.  Does anyone have any ideas as to:

1)  how I can set up my computer to reproduce this problem?
2)  how I can fix the bug?

Thanks in advance.

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Asked On
2005-10-05 at 10:53:30ID21584922
Tags

winmgmts

Topics

Visual Basic Programming

,

VB Script

Participating Experts
2
Points
500
Comments
12

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Answers

 

by: Erick37Posted on 2005-10-05 at 11:08:00ID: 15024200

It sounds like a permissions issue.  Perhaps the user does not have sufficient rights on the computer to connect to WMI?

 

by: richelieu7777Posted on 2005-10-05 at 11:09:28ID: 15024209

They double checked that they have Administrator rights, the same as me.

 

by: Erick37Posted on 2005-10-05 at 12:02:55ID: 15024651

Ok
Check the COM security settings in:
Control Panel->Component Services
                             |
                             +--Computers
                                    |
                                    +--My Computer

right click "My Computer"
Select "Properties" menu item
[COM Security] tab

 

by: richelieu7777Posted on 2005-10-05 at 12:29:49ID: 15024863

Unfortunately I don't think this is the issue either because the customer *is* able to instantiate other classes in the ActiveX DLL; they just can't instantiate the class that contains the WMI code.

 

by: Erick37Posted on 2005-10-05 at 13:31:20ID: 15025341

Can they use WMI on the computer at all?  From VBScript for example?

 

by: richelieu7777Posted on 2005-10-05 at 14:22:36ID: 15026066

Erick37,

I have never used VBScript; only VB6, C#, C++ 6.0, VBA.  Do you have an example I could use to determine whether they can run a WMI at all?

I can try "Set objWMIService = GetObject("winmgmts:root\default") but again, this would only be in VB6 or VBA.

By the way, I have verified with the customer that even though the COM Security tab had "Allow" for all fields, the problem still existed.

They also report that they get the message "Failed to connect to <local computer> because "Win32: Access is denied." when performing step #4 of the following:

    1. Right-click on My Computer and click Manage.
    2. Double-click Services and Applications and then double-click WMI Control.
    3. Right-click WMI Control and then click Properties.
    4. In the WMI Control Properties dialog box click the Security tab.



 

by: gecko_au2003Posted on 2005-10-05 at 14:40:20ID: 15026190

here is a vbscript WMI example :

'--------------------------

Option Explicit
Dim objWMIService, objItem, colItems
Dim strComputer, strList

On Error Resume Next
strComputer = "."

' WMI Connection to the object in the CIM namespace
Set objWMIService = GetObject("winmgmts:\\" _
& strComputer & "\root\cimv2")

' WMI Query to the Win32_OperatingSystem
Set colItems = objWMIService.ExecQuery
("Select * from Win32_OperatingSystem")

' For Each... In Loop (Next at the very end)
For Each objItem in colItems
   WScript.Echo "Machine Name: " & objItem.CSName & VbCr & _
   "===================================" & vbCr & _
  "Processor: " & objItem.Description & VbCr & _
   "Manufacturer: " & objItem.Manufacturer & VbCr & _
   "Operating System: " & objItem.Caption & VbCr & _
   "Version: " & objItem.Version & VbCr & _
   "Service Pack: " & objItem.CSDVersion & VbCr & _
   "CodeSet: " & objItem.CodeSet & VbCr & _
   "CountryCode: " & objItem.CountryCode & VbCr & _
   "OSLanguage: " & objItem.OSLanguage & VbCr & _
   "CurrentTimeZone: " & objItem.CurrentTimeZone & VbCr & _
   "Locale: " & objItem.Locale & VbCr & _
   "SerialNumber: " & objItem.SerialNumber & VbCr & _
   "SystemDrive: " & objItem.SystemDrive & VbCr & _
   "WindowsDirectory: " & objItem.WindowsDirectory & VbCr & _
   ""
Next
WSCript.Quit

'-------------------------------------------

Copy and paste the above section between the 2 lines into a text file, rename the txt file extension to .vbs and run it, that will return info about your O/S.

I got that from here :

http://www.computerperformance.co.uk/vbscript/wmi_secrets.htm#Example_2_-_WMI_Script_to_Obtain_Information_about_the_Operating_System_

If you dont see the file extensions of the files then you have to open my computer or within any folder go to :

Tools --> Folder options --> View

Then uncheck the checkbox where it says "Hide extensions for known file types"

I hope this helps :)

 

by: gecko_au2003Posted on 2005-10-05 at 14:41:13ID: 15026192

Also what happens if they create a new user account that has admin priveledges and login to that new account and then try to run a wmi script or to use wmi ?

 

by: richelieu7777Posted on 2005-10-05 at 18:33:06ID: 15027435

Well the customer is unable to get back with me right away.  But I did find another way to change the WMI permissions:

Control Panel->Administrative Tools
Double click on Component Services
Double click on Component Services in the new window
Double Click on Computers in the right pane
Double click on My Computer in the right pane
Double click on DCOM Config in the right pane
Right click on "Windows Management and Instrumentation" icon in the right pane
Select Properties
Select the "Security" Tab
Select "Customize" for all three frames
Click on all three "Edit" buttons and make sure each checkbox is "Allow"


If "Deny" is selected the "Permissions Denied" error occurs *even though all* the checkboxes of the  Component Services->"My Computer"->"Properties"->[COM Security] tab are all "ALLOW'.

I haven't got a definitive answer from the customer yet as to whether this latest DCOM WMI permission is the cause, but you guys have steered me in the right direction, I believe.  So I would like to split the 500 points between Erick37 and "gecko_au2003".  How do I split the points?  Do I select "Accept" for both answers?


 

by: richelieu7777Posted on 2005-10-05 at 18:37:45ID: 15027453

gecko_au2003,

I created the VBS file that you sent me.  But how do I run it?  I tried running it from the DOS prompt, but it didn't work.  Do I run it within VB????

 

by: richelieu7777Posted on 2005-10-05 at 18:42:43ID: 15027479

Is VBScript a standalone application?  I have Visual Studio 6.0 Enterprise Edition, but VBScript does not appear to be included.

Is there a place I can download an evaluation copy of VBScript to run this WMI script?

 

by: richelieu7777Posted on 2005-10-05 at 18:46:24ID: 15027495

Never mind.  I figured it out.  I *can* run the VBS file from the DOS prompt.  Its just that it was generating an error when I did so.  To fix this I had to put:

              ("Select * from Win32_OperatingSystem")

on the same line as

              Set colItems = objWMIService.ExecQuery

 for it to work.

20120131-EE-VQP-002

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