Problems contacting Domain Controller

Asked

Viewed 55 times

0

I made a program that accesses directories on the network. This program uses the windows API WNetAddConnection2. An example of implementing this API is available in C# in the SOEN. Here is the code for reference:

public class NetworkConnection : IDisposable
{
    string _networkName;

    public NetworkConnection(string networkName, 
        NetworkCredential credentials)
    {
        _networkName = networkName;

        var netResource = new NetResource()
        {
            Scope = ResourceScope.GlobalNetwork,
            ResourceType = ResourceType.Disk,
            DisplayType = ResourceDisplaytype.Share,
            RemoteName = networkName
        };

        var userName = string.IsNullOrEmpty(credentials.Domain)
            ? credentials.UserName
            : string.Format(@"{0}\{1}", credentials.Domain, credentials.UserName);

        var result = WNetAddConnection2(
            netResource, 
            credentials.Password,
            userName,
            0);

        if (result != 0)
        {
            throw new Win32Exception(result);
        }   
    }

    ~NetworkConnection()
    {
        Dispose(false);
    }

    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }

    protected virtual void Dispose(bool disposing)
    {
        WNetCancelConnection2(_networkName, 0, true);
    }

    [DllImport("mpr.dll")]
    private static extern int WNetAddConnection2(NetResource netResource, 
        string password, string username, int flags);

    [DllImport("mpr.dll")]
    private static extern int WNetCancelConnection2(string name, int flags,
        bool force);
}

[StructLayout(LayoutKind.Sequential)]
public class NetResource
{
    public ResourceScope Scope;
    public ResourceType ResourceType;
    public ResourceDisplaytype DisplayType;
    public int Usage;
    public string LocalName;
    public string RemoteName;
    public string Comment;
    public string Provider;
}

public enum ResourceScope : int
{
    Connected = 1,
    GlobalNetwork,
    Remembered,
    Recent,
    Context
};

public enum ResourceType : int
{
    Any = 0,
    Disk = 1,
    Print = 2,
    Reserved = 8,
}

public enum ResourceDisplaytype : int
{
    Generic = 0x0,
    Domain = 0x01,
    Server = 0x02,
    Share = 0x03,
    File = 0x04,
    Group = 0x05,
    Network = 0x06,
    Root = 0x07,
    Shareadmin = 0x08,
    Directory = 0x09,
    Tree = 0x0a,
    Ndscontainer = 0x0b
}

Normally this API works smoothly. However between two machines on my network (and so far, only these) the problem System.IO.IOException: The system cannot contact a domain controller to service the authentication request. Please try again later. occurs. What are the reasons that may cause this problem to occur and how can I resolve it?

c#

  • I had trouble with a service when we need to use secure protocol. In my case, I was not exposing the endpoint correctly and consequently the service could not reach the controller. I hope it helps.

  • @Can Andremesquita explain exactly what it is to "expose the endpoint correctly"? What he did?

  • Bruno, at the time I used this how-to to guide me on the configuration of endpoint. HOW-TO.

1 answer

0

I had several problems dealing with network directories and would like to leave a list of recommendations that should be followed if you use the same API I used.

  1. At some point your connection may stop working, if this happens you should close your current connection and open a new one
  2. You may also have problems closing the link, if this happens, try again
  3. Always specify the host name in your credentials

Browser other questions tagged c#

You are not signed in. Login or sign up in order to post.