Grpc.Core.RpcException version 1.8.0

[MatheusNani]

Description

Upon upgrading "Microsoft.Azure.Functions.Worker.Extensions.DurableTask" from version 1.2.1 to 1.8.0, I began receiving the following error:

Actual behavior

Grpc.Core.RpcException: Status(StatusCode="Unavailable", Detail="Error connecting to subchannel.", DebugException="System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it.")
[2025-09-22T19:53:06.654Z] ---> System.Net.Sockets.SocketException (10061): No connection could be made because the target machine actively refused it.
[2025-09-22T19:53:06.655Z] at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.ThrowException(SocketError error, CancellationToken cancellationToken)
[2025-09-22T19:53:06.657Z] at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.System.Threading.Tasks.Sources.IValueTaskSource.GetResult(Int16 token)
[2025-09-22T19:53:06.659Z] at System.Net.Sockets.Socket.g__WaitForConnectWithCancellation|285_0(AwaitableSocketAsyncEventArgs saea, ValueTask connectTask, CancellationToken cancellationToken)
[2025-09-22T19:53:06.661Z] at Grpc.Net.Client.Balancer.Internal.SocketConnectivitySubchannelTransport.TryConnectAsync(ConnectContext context, Int32 attempt)
[2025-09-22T19:53:06.663Z] --- End of inner exception stack trace ---
[2025-09-22T19:53:06.665Z] at Grpc.Net.Client.Balancer.Internal.ConnectionManager.PickAsync(PickContext context, Boolean waitForReady, CancellationToken cancellationToken)
[2025-09-22T19:53:06.667Z] at Grpc.Net.Client.Balancer.Internal.BalancerHttpHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
[2025-09-22T19:53:06.669Z] at System.Net.Http.HttpMessageInvoker.g__SendAsyncWithTelemetry|6_0(HttpMessageHandler handler, HttpRequestMessage request, CancellationToken cancellationToken)
[2025-09-22T19:53:06.671Z] at Grpc.Net.Client.Internal.GrpcCall2.RunCall(HttpRequestMessage request, Nullable1 timeout)
[2025-09-22T19:53:06.672Z] at Grpc.Net.Client.Internal.GrpcCall`2.GetResponseHeadersCoreAsync()
[2025-09-22T19:53:06.674Z] at Microsoft.DurableTask.Client.Grpc.GrpcDurableTaskClient.GetInstancesAsync(String instanceId, Boolean getInputsAndOutputs, CancellationToken cancellation

Known workarounds

When I Downgrade the package to previously version 1.2.1 it works.

App Details

• Function Runtime Version 2.0
• net8.0
• v4
• Microsoft.ApplicationInsights.WorkerService Version="2.22.0"
• Microsoft.Azure.AppConfiguration.Functions.Worker Version="8.4.0"
• Microsoft.Azure.Functions.Extensions Version="1.1.0"
• Microsoft.Azure.Functions.Worker Version="2.1.0"
• Microsoft.Azure.Functions.Worker.Sdk Version="2.0.5"
• Microsoft.Azure.Functions.Worker.Extensions.DurableTask Version="1.8.0"
• Microsoft.Azure.Functions.Worker.Extensions.Http Version="3.3.0"
• Microsoft.Azure.Functions.Worker.Extensions.Storage Version="6.3.0"
• Microsoft.Azure.Functions.Worker.Extensions.Timer Version="4.3.1"
• Microsoft.Azure.Functions.Worker.Extensions.ServiceBus Version="5.23.0"
• Microsoft.Azure.Functions.Worker.ApplicationInsights Version="2.0.0"
• Microsoft.Extensions.Configuration.UserSecrets Version="9.0.0"
• Microsoft.Extensions.DependencyInjection Version="9.0.0"

Do I need to upgrade any other package or change anything in code to make it work when using the version 1.8.0?

[nytian]

Hey @MatheusNani Thanks for opening the case, Does your app run locally or at Azure? If at Azure, can you share with me your function app name and time stamp when you have issue? Thanks!