Not supported exception when grabbing remote machine name

Question

2.50/5 (2 votes)

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Getting a return value of 50(The request is not supported.). The MSDN documentation says this should only happen if the computer is not > 2000. These are XP machines that I'm querying.
Any ideas?

http://msdn.microsoft.com/en-us/library/dd877207%28v=vs.85%29.aspx[^]

C#

var computer_name = "";
    int entry_count;
    string[] computer_names;
    var ret = PInvoke.NetEnumerateComputerNames(host, NET_COMPUTER_NAME_TYPE.NET_ALL_COMPUTER_NAMES, 0, out entry_count, out computer_names);
    if (PInvoke.ERROR_SUCCESS == ret && entry_count > 0)
    {
        computer_name = computer_names[0];
    }
    else
    {
        if (Config.Debug)
            Utilities.ReportError("Getting computer name for " + host + " failed: " + new Win32Exception(ret).Message, false, true);
    }
    return computer_name;
}
catch (Exception e)
{
    if (Config.Debug)
        Utilities.ReportError("Getting computer name for " + host + " failed: " + e.Message, false, true);
    return "";
}

Posted 10-Jun-11 4:18am

User 7379439

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Comments

Dave Kreskowiak 10-Jun-11 13:12pm

Is the account you're running this code under an admin on the target machine?

[no name] 10-Jun-11 14:16pm

Yes. He is a domain admin. We are connecting ipc$ share. This command should work with null sessions, though.

Sergey Alexandrovich Kryukov 10-Jun-11 14:08pm

Where is your declaration of PInvoke?
Where is your exception dump? Don't forget about Exceptions.Stack and InnerExceptions (all of them, recursively).
--SA

[no name] 10-Jun-11 14:17pm

No exceptions are being thrown. ret == 50. 0 results, invalid pointer for the last arg.
This does work on some systems. I think these systems are non-XP, but it could just be the configuration of one XP system which we cloned several times for VMs.
[DllImport("Netapi32.dll", SetLastError = true)]
public static extern int NetEnumerateComputerNames(
[MarshalAs(UnmanagedType.LPWStr)]
string server_name,
NET_COMPUTER_NAME_TYPE name_type,
int reserved,
out int entry_count,
[MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.LPWStr)]
out string[] computer_names
);

Kim Togo 12-Jun-11 12:19pm

In the MSDN doc for NetEnumerateComputerNames it says:

Remarks
The NetEnumerateComputerNames function is supported on Windows Vista and later.

So no Windows XP support on that.

[no name] 12-Jun-11 12:23pm

This is what the article says above that remark.

ERROR_NOT_SUPPORTED
The request is not supported. This error is returned if the target computer specified in the Server parameter on which this function executes is running on Windows 2000 and earlier.

Kim Togo 13-Jun-11 1:38am

You are right.
ERROR_NOT_SUPPORTED could also mean that the function NetEnumerateComputerNames is not supported on remote computer?

[no name] 13-Jun-11 9:13am

How to say DUH in a polite way?

[no name] 12-Jun-11 12:21pm

Agreed. This is a documentation fail. I was going to post this as the solution, but I also found the right way to do it. Will post on Monday.

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User 7379439 · Accepted Answer · 2011-06-13T03:38:00

Two answers. Okay. So this is a straight up documentation fail on MSDN's part ... 3 times. I'm going to write them to tell them the should self-fornicate.

It says it will not work in Windows 2000 or earlier. It says that it will not work in anything before Vista. It says that the earliest supported version is Server 2003. Idiots.

The solution, other than sterilization, is in the next answer.

User 7379439 · Accepted Answer · 2011-06-13T03:51:00

Here's the proper way to do this.

http://msdn.microsoft.com/en-us/library/aa370663%28v=vs.85%29.aspx[^]

This says it will work in Server 2000 and above; but we all know, now, how much we can really trust Microsoft.

C#

IntPtr buffer;
var ret = PInvoke.NetWkstaGetInfo(host, 100, out buffer);
var strut_size = Marshal.SizeOf(typeof (WKSTA_INFO_100));
WKSTA_INFO_100 wksta_info;
if (PInvoke.ERROR_SUCCESS == ret)
{
    wksta_info = (WKSTA_INFO_100) Marshal.PtrToStructure(buffer, typeof (WKSTA_INFO_100));
    if (!string.IsNullOrEmpty(wksta_info.computer_name))
        return wksta_info.computer_name;
}

Not supported exception when grabbing remote machine name

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