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Can't access hardware info of remote computer with WMI: Access is denied

I am trying to create an application that uses WMI to retrieve information about a computer on my local network. When I run it, I get an access denied error. Here is the code:
private void GetHDDdetails()
{
ConnectionOptions options = new ConnectionOptions();
options.Username = "username";
options.Password = "password";
options.Impersonation = ImpersonationLevel.Impersonate;
ManagementScope oMs = new ManagementScope("\\\\remoteHostName\\root\\cimv2", options);
ObjectQuery oQuery = new ObjectQuery("SELECT Size FROM Win32_DiskDrive");
ManagementObjectSearcher oSearcher = new ManagementObjectSearcher(oMs, oQuery);
ManagementObjectCollection oCollection = oSearcher.Get();
foreach (ManagementObject obj in oCollection)
{
hddBox.Text = obj["Size"].ToString();
}
}
I have replaced some of the info above, such as user name and password, with placeholders for this post.
Some of the things I have tried is this: Disabling firewall on both machines, making sure TCP NetBIOS service and RCP and WMI services are running on both. The account I am using is an administrator on the local computer. Everything I have found online tells me to check these, but it is obviously something else.
If someone can point me in the right direction, that would be great.

Please check using wbemtest that you can access the information from remote machine. And i hope you are replacing remoteHostName properly.
And make changes to authentication level, if you can.
scope.Options.EnablePrivileges = true;
scope.Options.Authentication = AuthenticationLevel.PacketPrivacy;

win32_processor out of memory

I want to get id processor in .NET with WMI but when I'm using the get() method from the ManagementObjectSearcher, I'm getting an out of memory exception ...
If you want to take a look from the code see below :
ManagementObjectSearcher searcher = new ManagementObjectSearcher(
"select * from Win32_Processor");
foreach (ManagementObject share in searcher.Get())
foreach (PropertyData PC in share.Properties)
if (PC.Name.Equals("ProcessorId"))
return (string)PC.Value;
return null;
This code works on others computers but not on mine ...
I'm using windows 7.
What is the problem ?
I tried to restart WMI service and that not resolve my problem :(

There are several reasons which could cause out of memory exception.
possible memory leak in WMI, source:
http://brooke.blogs.sqlsentry.net/2010/02/win32service-memory-leak.html
check whether you have permission(s), that would explain why does your code work on some computers and why doesn't on yours.
run your code as Administrator (for debugging start VS as Administrator)
Here is an other code snippet, try this one as well... who knows
Sample:
public static String GetCPUId()
{
String processorID = "";
ManagementObjectSearcher searcher = new ManagementObjectSearcher(
"Select * FROM WIN32_Processor");
ManagementObjectCollection mObject = searcher.Get();
foreach (ManagementObject obj in mObject)
{
processorID = obj["ProcessorId"].ToString();
}
return processorID;
}
Source: WIN32_Processor::Is ProcessorId Unique for all computers

Uninstall application on remote computer silently

I am developing a C# program to remotely uninstall an application. It works fine but the problem is that it does not list all of the installed products on a particular selected computer.
The code for listing the installed product using WMI is :
void ListAllProducts()
{
try
{
ConnectionOptions connection = new ConnectionOptions();
connection.Username = Connect.UserName;
connection.Password = Connect.Password;
connection.Authority = "ntlmdomain:MSHOME";
ManagementScope scope = new ManagementScope("\\\\"+ Connect.MachineName +"\\root\\CIMV2", connection);
scope.Connect();
ObjectQuery query = new ObjectQuery("SELECT * FROM Win32_Product");
ManagementObjectSearcher searcher = new ManagementObjectSearcher(scope, query);
System.Threading.Thread.Sleep(5000);
foreach (ManagementObject queryObj in searcher.Get())
{
listBox4.Items.Add(queryObj["Name"].ToString());
listBox2.Items.Add (queryObj["Name"].ToString ());
listBox1.Items.Add(queryObj["IdentifyingNumber"].ToString());
listBox3.Items.Add(queryObj["Version"].ToString());
}
}
catch (ManagementException e)
{
MessageBox.Show("An error occurred while querying for WMI data: " + e.Message);
}
}
The code for uninstalling all product is :
void UninstallProduct()
{
try
{
ConnectionOptions connection = new ConnectionOptions();
connection.Username = Connect.UserName;
connection.Password = Connect.Password;
connection.Authority = "ntlmdomain:MSHOME";
ManagementScope scope = new ManagementScope("\\\\"+Connect.MachineName +"\\root\\CIMV2", connection);
scope.Connect();
ManagementObject classInstance = new ManagementObject(scope, new ManagementPath ("Win32_Product.IdentifyingNumber='"+listBox1.Text +"',Name='"+listBox2.Text+"',Version='"+ listBox3.Text+"'"),null);
// no method in-parameters to define
// Execute the method and obtain the return values.
ManagementBaseObject outParams =
classInstance.InvokeMethod("Uninstall", null, null);
// List outParams
MessageBox.Show ("Uninstallation Starts");
}
catch(ManagementException err)
{
MessageBox.Show("An error occurred while trying to execute the WMI method: " + err.Message);
}
}
Please help me out to list all the products installed on the selected machine and to uninstall it without the consent of the user of that selected machine.

I believe your question relates to knowing which applications are installed on a remote machine. Once you know that, you can use your code to uninstall them. With that being the case, here is a link to an article on how to list all of the applications (with their uninstall information) on a remote computer:
http://mdb-blog.blogspot.com/2010/12/c-check-if-programapplication-is.html

The WMI Win32_Product only represents products that are installed by Windows Installer. To get a list of all installed products, you need to enumerate the subkeys of the SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall registry key. To do this remotely, you can use the WMI registry class StdRegProv class. TechNet includes sample scripts that show how this can be done, and which you can adapt to your particular needs:
How do I list all the installed applications on a given machine?
List Installed Software

c# Active Directory via WMI

Does anyone has some example about accessing Active Directory, LDAP querying using WMI (System.Management namespace) and not System.DirectoryServices namespace.
Here on MSDN page it is described a little using CIM classes
http://msdn.microsoft.com/en-us/library/aa392320(v=VS.85).aspx
But I cant find some C# example realizing it.
For example, to access some Win32 class you have to initialize Scope object to use CIMV2 namespace
private ConnectionOptions connection;
private ManagementScope scope;
...
connection = new ConnectionOptions();
...
scope = new ManagementScope("\\\\" + computer + "\\root\\CIMV2", connection);
try
{
scope.Connect();
}
And use ObjectQuery class for querying WMI data
ObjectQuery objectQuery = new ObjectQuery("SELECT Name FROM Win32_Processor");
ManagementObjectSearcher searcher = ManagementObjectSearcher(scope, objectQuery);
foreach (ManagementObject queryObj in searcher.Get())
{
return queryObj["Name"].ToString();
}
How is it possible to access AD using the same scope?
Thanks :)

Problem retrieving Hostaddress from Win32_TCPIPPrinterPort

I'm running into an odd issue retrieving printer port addresses.
When I get all the entries in Win32_TCPIPPrinterPort, the HostAddress field (which should have the IP address) is usually blank/null, only the port name has a value. To make it a bit stranger, if a particular port is not in use by any printer, THEN the HostAddress will have the the proper value.
The C# code is simple, and results in something like this;
IP_192.168.1.100,
printerportxyz,
richTextBox1.Clear();
ManagementObjectSearcher portSearcher = new ManagementObjectSearcher("root\\CIMV2",
"SELECT * FROM Win32_TCPIPPrinterPort");
foreach (ManagementObject port in portSearcher.Get())
{
richTextBox1.AppendText(
String.Format("Name: {0} HostAddress: {1}",
port["Name"],
port["HostAddress"])
);
}
I also tried the same thing in WSH/VBS, and saw the same behavior.

I ended up having to re-visit this, and making another attempt. I found that the built-in prnport.vbs managment script had no issues - looking into it I saw that while establishing its WMI connection it had oService.Security_.Priveleges.AddAsString "SeLoadDriverPrivilege"
the solution in C# ended up specifying the WMI ConnectionOptions and setting EnablePrivileges to true. Then the HostAdress was no longer null for unused or in-use ports.
ConnectionOptions connOptions = new ConnectionOptions();
connOptions.EnablePrivileges = true;
ManagementScope mgmtScope = new ManagementScope("root\\CIMV2", connOptions);
mgmtScope.Connect();
ObjectQuery objQuery = new ObjectQuery("SELECT * FROM Win32_TCPIPPrinterPort");
ManagementObjectSearcher moSearcher = new ManagementObjectSearcher(mgmtScope, objQuery);
foreach (ManagementObject mo in moSearcher.Get())
{
Console.WriteLine(String.Format("PortName={0} HostAddress={1}", mo["Name"], mo["HostAddress"]));
}