C#: Why I can only connect to my ip address but the other ip address, getting error (WMI)

0

I'm trying to connect to other network using my pc but im getting error

(System.Runtime.InteropServices.COMException: 'The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)')

However, It's only working if I connect to my pc itself. Is there any approach aside from this process because I cant even figure what's the error if it's like firewall,my codes or my anti-virus etc.

private void Form2_Load(object sender, EventArgs e)
{

    // remote computer.
    ManagementScope scope =
        new ManagementScope(
        "\\\\172.20.1.50\\root\\cimv2");
    scope.Connect();


    //Query system for Operating System information
    ObjectQuery query = new ObjectQuery(
        "SELECT * FROM Win32_OperatingSystem");
    ManagementObjectSearcher searcher =
        new ManagementObjectSearcher(scope, query);

    ManagementObjectCollection queryCollection = searcher.Get();
    foreach (ManagementObject m in queryCollection)
    {
        // Display the remote computer information


        MessageBox.Show(m["csname"].ToString());
    }
}
c#
networking
asked on Stack Overflow Apr 5, 2018 by Dev George • edited Apr 5, 2018 by trungduc

1 Answer

0

I think you should read through this

Connecting to WMI Remotely with C#

  1. Create a ManagementScope object, using the name of the computer and the WMI path, and connect to your target with a call to ManagementScope.Connect().

  2. If you connect to a remote computer in a different domain or using a different user name and password, then you must use a ConnectionOptions object in the call to the ManagementScope.

The ConnectionOptions contains properties for describing the Authentication, Impersonation, username, password, and other connection options.

Exmaple

ConnectionOptions options = new ConnectionOptions();
options.Impersonation = System.Management.ImpersonationLevel.Impersonate;

// options takes more arguments, you need to read up on what you want

ManagementScope scope = new ManagementScope("\\\\FullComputerName\\root\\cimv2", options);
scope.Connect();

ManagementPath path = new ManagementPath("Win32_NetworkAdapterConfiguration");
ObjectGetOptions o = new ObjectGetOptions(null, System.TimeSpan.MaxValue, true);
ManagementClass objMC = new ManagementClass(scope, path, o);
...

Generally speaking, it is recommended that you set your Impersonation level to Impersonate unless explicitly needed otherwise

Assuming you have the correct credentials, i think this will turn out to be a firewall issue, or a windows setting on the remote computer.

Id apply the following firewall rules first and work backwards. Or for a test completely disable firewalls on the target machine

  • COM+ Network Access (DCOM-In)

  • Remote Event Log Management (NP-In)

  • Remote Event Log Management (RPC)

  • Remote Event Log Management (RPC-EPMAP)

  • Windows Management Instrumentation (ASync-In)

  • Windows Management Instrumentation (DCOM-In)

  • Windows Management Instrumentation (WMI-In)


Additional reading

Connecting to WMI Remotely with C#

ManagementScope Class

ConnectionOptions Class

ObjectGetOptions Class

ManagementPath Class

ManagementClass Class

Disclaimer : You will have to read about these topics and work out what you need in your situation.

answered on Stack Overflow Apr 5, 2018 by AAAbbbCCCddd

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