OPC UA Connected but No Data Updating – Historian Communication Issue on OCMC

Question

Hi everyone,
I’m working on an OCMC setup where the OPC UA connection is successfully established—I can see the device structure and diagnostics, and System Platform is configured correctly. However, real-time data is not updating.

The logs show repeated gRPC errors when trying to connect to the historian at SRPD8929321:32565, with StatusCode="Unavailable" and error = 164 (Communication Error). Despite the OPC UA server showing as connected, the historian fails to communicate.

Any insights on resolving this historian communication issue or validating historian readiness would be greatly appreciated!

Thanks in advance.

Heres the error code:

SRPAOS923404.SRPDB923291: Failed to connect to Historian at SRPDB923291:32565 - error = 164 (Communication Error) - Grpc.Core.RpcException: Status(StatusCode="Unavailable", Detail="Error starting gRPC call. HttpRequestException: An error occurred while sending the request. WebException: Unable to connect to the remote server SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 10.233.34.194:32565", DebugException="System.Net.Http.HttpRequestException: An error occurred while sending the request.") ---> System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 10.233.34.194:32565
at System.Net.Sockets.Socket.InternalEndConnect(IAsyncResult asyncResult)
at System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult)
at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)
--- End of inner exception stack trace ---
at System.Net.HttpWebRequest.EndGetRequestStream(IAsyncResult asyncResult, TransportContext& context)
at System.Net.Http.HttpClientHandler.GetRequestStreamCallback(IAsyncResult ar)
--- End of inner exception stack trace ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Grpc.Net.Client.Web.GrpcWebHandler.<SendAsyncCore>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
at Grpc.Net.Client.Internal.GrpcCall`2.<RunCall>d__82.MoveNext()
--- End of inner exception stack trace ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Grpc.Net.Client.Internal.HttpClientCallInvoker.BlockingUnaryCall[TRequest,TResponse](Method`2 method, String host, CallOptions options, TRequest request)
at Grpc.Core.Interceptors.InterceptingCallInvoker.<BlockingUnaryCall>b__3_0[TRequest,TResponse](TRequest req, ClientInterceptorContext`2 ctx)
at Archestra.Historian.GrpcClient.ClientInterceptor.BlockingUnaryCall[TRequest,TResponse](TRequest request, ClientInterceptorContext`2 context, BlockingUnaryCallContinuation`2 continuation)
at Grpc.Core.Interceptors.InterceptingCallInvoker.BlockingUnaryCall[TRequest,TResponse](Method`2 method, String host, CallOptions options, TRequest request)
at Grpc.Core.Interceptors.InterceptingCallInvoker.<BlockingUnaryCall>b__3_0[TRequest,TResponse](TRequest req, ClientInterceptorContext`2 ctx)
at Grpc.Core.ClientBase.ClientBaseConfiguration.ClientBaseConfigurationInterceptor.BlockingUnaryCall[TRequest,TResponse](TRequest request, ClientInterceptorContext`2 context, BlockingUnaryCallContinuation`2 continuation)
at Grpc.Core.Interceptors.InterceptingCallInvoker.BlockingUnaryCall[TRequest,TResponse](Method`2 method, String host, CallOptions options, TRequest request)
at ArchestrA.Grpc.Contract.History.HistoryService.HistoryServiceClient.GetInterfaceVersion(GetInterfaceVersionRequest request, CallOptions options)
at ArchestrA.Grpc.Contract.History.HistoryService.HistoryServiceClient.GetInterfaceVersion(GetInterfaceVersionRequest request, Metadata headers, Nullable`1 deadline, CancellationToken cancellationToken)
at Archestra.Historian.GrpcClient.GrpcHistoryClient.GetServerInterfaceVersion(UInt32& interfaceVersion)
at CHistoryConnectionGrpc.GetInterfaceVersion(CHistoryConnectionGrpc* , UInt32* pVersion, SError* error) [CommonBase.cpp, 965]

For SetUp Reference:

Richard Köhlerstrand · Accepted Answer

Just to follow-up on this comment, the error is indicating that your set up has some configuration error, still pointing at this incorrect Historian server. It does not mean that the whole system has issues and you can for sure expect other parts of logging to function correctly. 
 But as we can see on the log messages it is reported by two main objects (as far as we can see on your screenshots) 
 To back up somewhat, in Application Server, there are two Objects that can push Historian Data to a Historian, Your Application Engine Object , and your Platform Object (your platform actually includes a engine to service the management of your platform, but to simplify this is the scenario lets talk about them separately). 
 The reason for a Platform Object to contain configuration and availability to configure Historian connection is that your platform object contains several native values that can provide value in Historizing, but your Platform can be deployed without deploying an application engine, then if used, it can be configured separately. 
 
 But the platform object only ensures that Selected values and Attributes configured for logging are stored, it does not manage any additional objects historization. 
 Similar options applies for your Application Engine 
 
 The difference here is that your Application Engine ensures storage of History data to any other object deployed to it. And it is here that you need to ensure correct settings to have your object attributes configured for History to be logged to Historian. (Also Events and Alarm data can be historized in Historian based on your settings in the Historian part of Configurator tool). 
 Going to your errors in log 
 
 Any incorrect setting on your Platform or Application engine will generate this error, since it can not reach historian to store data. 
 
 In above example i have made an incorrect reference, where Historian is not responding. 
 This will generate the errors as you posted. 
 
 In your case, It seems to come from object SRPDB923391 in your galaxy, and looking at your examples, it is not this engine that is hosting your objects that you are trying to log, so it should not be the cause of your specific issue, but it would be something to update, since you mention that this historian has been removed.

OPC UA Connected but No Data Updating – Historian Communication Issue on OCMC

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