Question

Hy... I am trying to connect to a remote computer using WMI and C#. I get an error: The RPC server is unavailable. (Exception result HRESULT: 0x800706BA). I don t know if that is code related so this is what I m using:

serverN = InputText.Text;//serverN=IPAddress
userN = userName.Text;
passN = passName.Text;
if (String.IsNullOrEmpty(serverN))
                serverN = ".";
ManagementClass manC = new ManagementClass("Win32_LogicalDisk");
string strScope = string.Format(@"\{0}
ootcimv2", serverN);
ConnectionOptions conOpt = new ConnectionOptions();
conOpt.Username = userN;
conOpt.Password = passN;
manC.Scope = new ManagementScope(strScope, conOpt);

When I try to get instances from manC I catch the exception with the RPC being unavailable. Locally it works so I m guessing that I have to make some settings on the remote machine (OS: Windows XP sp2). I have checked so that it allows remote connections and I have inserted command netsh firewall set service RemoteAdmin into command prompt. Do I need to set a domain name or a networkid? Or it is something else I m missing?

Answer 1

I know it might be late for you, but for others who might stumble on this post: If you re sure it is not a user rights issue (you know the folder has the permissions) Check what you re giving as AuthenticationLevel to the ConnectionOptions object. I iterated through every one of them and for me the only that works is the PacketPrivacy option.

ConnectionOptions conOp = new ConnectionOptions();
conOp.Authentication = System.Management.AuthenticationLevel.PacketPrivacy;

Answer 2

也许需要更多关于你成立的信息。计算机是否在同一领域?

You could start by testing if the WMI is working before trying it in C#. Try the following from a command prompt to see if that works.

wmic /node: path Win32_logicaldisk

wmic also has a /user option you can use to test with your username and password.

您可尝试在ConnectionOptions 上修改Ausentication and Impersonation property。这往往从环境变化到环境,并可能导致联系失败。

Answer 3

Not to seem rude but: are you sure the value in InputText.Text is correct? One easy way to get "The RPC server is unavailable" is to supply a bad name for the server. It might be worth examining the value of scope in the debugger after the string.Format call.

BTW 我假定,这只是你创造和启动一个称为范围,但通过一个称为“范围”的变数,供管理范围建筑商使用?

Answer 4

象许可这样的声音是IMHO。根据我的经验,你需要建立一些明确的安全许可,以发出遥远的海事委员会电话。

http://technet.microsoft.com/en-us/library/cc78753328WS.10%29.aspx”rel=“nofollow” 您是否制定了适当的许可?

Answer 5

The code works locally because you re already logged on. Remote WMI connections always require additional security rights. Your first code update should include impersonationLevel: http://msdn.microsoft.com/en-us/library/windows/desktop/aa389288%28v=vs.85%29.aspx

如果人才充裕,那么下一步应该是明确全权证书。这将发挥作用。还有一种选择,但我不建议“授权”,允许这种账户成为该领域的任何账户。

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