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I got the answer from the Siemens official support: Configuration on the OPC UA server is default.Īfter andrewcullen tip, we are getting the below log in the tracelog.txt file and error when catching the exception that saysĪn unexpected error occurred while connecting to the server. OPC UA server runs on Siemens Simatic HMI TP700 Comfort. Stack trace of the exception is this: Server stack trace:Īt Opc.Ua.(IAsyncResult result)Īt Opc.Ua.(TimeSpan timeout)Īt .Open(TimeSpan timeout)Īt .OnOpen(TimeSpan timeout)Īt .(ServiceChannel channel, TimeSpan timeout)Īt .CallOnceManager.CallOnce(TimeSpan timeout, CallOnceManager cascade)Īt .EnsureOpened(TimeSpan timeout)Īt .Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object ins, Object outs, TimeSpan timeout)Īt .Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object ins, Object outs)Īt .InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)Īt .Invoke(IMessage message)Īt .RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)Īt .RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)Īt Opc.Ua.ISessionChannel.CreateSession(CreateSessionMessage request)Īt Opc.Ua.SessionChannel.CreateSession(CreateSessionMessage request)Īt Opc.Ua.SessionClient.CreateSession(RequestHeader requestHeader, ApplicationDescription clientDescription, String serverUri, String endpointUrl, String sessionName, Byte clientNonce, Byte clientCertificate, Double requestedSessionTimeout, UInt32 maxResponseMessageSize, NodeId& sessionId, NodeId& authenticationToken, Double& revisedSessionTimeout, Byte& serverNonce, Byte& serverCertificate, EndpointDescriptionCollection& serverEndpoints, SignedSoftwareCertificateCollection& serverSoftwareCertificates, SignatureData& serverSignature, UInt32& maxRequestMessageSize)Īt Opc.Ua.(String sessionName, UInt32 sessionTimeout, IUserIdentity identity, IList`1 preferredLocales)Īt Opc.Ua.(String sessionName, IUserIdentity identity)Īny help would be appreciated. When connecting to the OPC UA server using client provided in the article, I get this message: Connection to OPC UA server using the Siemens OPC Scount v10 works fine. I tryed to connect to OPC UA server using the client provided on this page.