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Connecting to a PLC with anonymous users turned off

Cwardltu
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20 Nov 2025 21:34 #14472 by Cwardltu

Connecting to a PLC with anonymous users turned off was created by Cwardltu

Is it possible to connect to a plc using a username and password with anonymous users turned off and not trusted cert configured. I am having issues doing so; initially i connect fine but if i were to reinitialize i start getting issues like the ones below:

I have also added a code snipit below.

x80860000: OPC UA service result - {BadSecureChannelClosed}. The secure channel has been closed. [...]
[Connection Event] Server is UNAVAILABLE - OPC UA service result - {BadSecureChannelClosed}. The secure channel has been closed.
+ The server may have rejected the connection because it does not trust the client (e.g. certificate problem); check the diagnostics on the server side, if possible.
+ The client method called (or event/callback invoked) was 'ServerConditionChanged'.

Code:

public void ConnectAsync(string serverURL, string userName = null, string password = null)
{
    if (string.IsNullOrWhiteSpace(serverURL))
        throw new ArgumentNullException(nameof(serverURL));

    if (_connected)
        Disconnect();

    if (_client == null)
        _client = new EasyUAClient();

    // Accept any certificate
    EasyUAClientCore.SharedParameters.EngineParameters.CertificateAcceptancePolicy.AcceptAnyCertificate = true;

    _serverUrl = serverURL;

    Console.WriteLine("========================================");
    Console.WriteLine($"[Connect] Server URL: {serverURL}");

    // Simple endpoint creation - let client auto-select best available
    Endpoint = new UAEndpointDescriptor(serverURL);

    // Add username/password if provided
    if (!string.IsNullOrWhiteSpace(userName) && !string.IsNullOrWhiteSpace(password))
    {
        Console.WriteLine($"[Connect] Username: {userName}");
        Endpoint.UserIdentity.UserNameTokenInfo = new OpcLabs.BaseLib.IdentityModel.User.UserNameTokenInfo(userName, password);
    }
    else
    {
        Console.WriteLine("[Connect] Authentication: Anonymous");
    }

    // Try to connect by reading namespaces
    _namespaces = new Dictionary<int, string>();
    try
    {
        Console.WriteLine("[Connect] Connecting...");
        var nsValues = _client.ReadValue(Endpoint, UAVariableIds.Server_NamespaceArray);

        if (nsValues != null && nsValues is string[] namespaceValues)
        {
            int i = 0;
            foreach (var nsValue in namespaceValues)
            {
                _namespaces.Add(i++, nsValue);
            }
            Console.WriteLine($"[Connect] ✓ SUCCESS - {_namespaces.Count} namespaces");
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine("========================================");
        Console.WriteLine("[Connect] ✗ FAILED");
        Console.WriteLine($"[Connect] Exception: {ex.GetType().Name}");
        Console.WriteLine($"[Connect] Message: {ex.Message}");

        if (ex.InnerException != null)
        {
            Console.WriteLine($"[Connect] Inner: {ex.InnerException.GetType().Name}");
            Console.WriteLine($"[Connect] Inner Message: {ex.InnerException.Message}");

            if (ex.InnerException.InnerException != null)
            {
                Console.WriteLine($"[Connect] Inner-Inner: {ex.InnerException.InnerException.Message}");
            }
        }

        Console.WriteLine("========================================");
        throw;
    }

    _connected = _namespaces.Count > 0;

    if (_connected)
    {
        Console.WriteLine("========================================");
    }
    // SET UP CONNECTION MONITORING
    _connectionMonitoring = _client.GetService<IEasyUAClientConnectionMonitoring>();
    if (_connectionMonitoring != null)
    {
        _connectionMonitoring.ServerConditionChanged += onServerConditionChanged;
        Console.WriteLine("Connection monitoring enabled");
    }
    else
    {
        Console.WriteLine("Warning: Connection monitoring service not available");
    }

    _connectionControl = _client.GetService<IEasyUAClientConnectionControl>();
    if (_connectionControl == null)
    {
        Console.WriteLine("Warning: Connection control service not available");
    }
}

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