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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(288, 53%, 37%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
2021-01-24 02:24 - 2021-01-24 03:16 Connect EventHubs Fail With Message
{"ClassName":"System.Net.Sockets.SocketException","Message":"Name or service not known","Data":null,"InnerException":null,"HelpURL":null,"StackTraceString":" at Azure.Messaging.EventHubs.Amqp.AmqpConnectionScope.CreateAndOpenConnectionAsync(Version amqpVersion, Uri serviceEndpoint, EventHubsTransportType transportType, IWebProxy proxy, String scopeIdentifier, TimeSpan timeout)\n at Microsoft.Azure.Amqp.FaultTolerantAmqpObject1.OnCreateAsync(TimeSpan timeout)\n at Microsoft.Azure.Amqp.Singleton1.GetOrCreateAsync(TimeSpan timeout)\n at Microsoft.Azure.Amqp.Singleton1.GetOrCreateAsync(TimeSpan timeout)\n at Azure.Messaging.EventHubs.Amqp.AmqpConnectionScope.OpenProducerLinkAsync(String partitionId, TimeSpan timeout, CancellationToken cancellationToken)\n at Azure.Messaging.EventHubs.Amqp.AmqpProducer.CreateLinkAndEnsureProducerStateAsync(String partitionId, TimeSpan timeout, CancellationToken cancellationToken)\n at Microsoft.Azure.Amqp.FaultTolerantAmqpObject1.OnCreateAsync(TimeSpan timeout)\n at Microsoft.Azure.Amqp.Singleton1.GetOrCreateAsync(TimeSpan timeout)\n at Microsoft.Azure.Amqp.Singleton1.GetOrCreateAsync(TimeSpan timeout)\n at Azure.Messaging.EventHubs.Amqp.AmqpProducer.CreateBatchAsync(CreateBatchOptions options, CancellationToken cancellationToken)\n at Azure.Messaging.EventHubs.Amqp.AmqpProducer.CreateBatchAsync(CreateBatchOptions options, CancellationToken cancellationToken)\n at Azure.Messaging.EventHubs.Producer.EventHubProducerClient.CreateBatchAsync(CreateBatchOptions options, CancellationToken cancellationToken)\n at Azure.Messaging.EventHubs.Producer.EventHubProducerClient.CreateBatchAsync(CancellationToken cancellationToken)\n at IValon.Common.AzureEventHubs.EventHubsMessage.RunAsync(String eventHubName, String message)\n at IValon.Common.AzureEventHubs.EventHubsMessage.RunAsync(String eventHubName, String message)","RemoteStackTraceString":null,"RemoteStackIndex":0,"ExceptionMethod":null,"HResult":-2147467259,"Source":"System.Private.CoreLib","WatsonBuckets":null,"NativeErrorCode":-131073} MultipleConnectAsync.DnsCallback => MultipleConnectAsync.DoDnsCallback => MultipleConnectAsync.Fail
An Azure real-time data ingestion service.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(192, 26%, 28%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EH%3C/text%3E%3C/svg%3E)
Hello @栋 郭 ,
Thanks for the ask and using the forum .
We see that you have pasted the whole error trace , can you please give us more context about the use case , that will help us look into this issue better .
Waiting to hear from you on this .
Thanks
Himanshu
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(89.60000000000001, 39%, 18%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESK%3C/text%3E%3C/svg%3E)
Failure sounds like DNS resolution issue. Can you check couple things?
I've been using eventhubs before. There's no such problem.
Only 2021-01-24 02:24 - 2021-01-24 03:16 has a problem, the system does not do any processing, then it will be normal.
Can we determine whether it is a server problem or a client problem by reporting an error
It is a client problem. AMQP layer OpenConnection is failing which is supposed to create a TCP channel between client and the service.
Can determine whether it is a network problem or a program, Is there any solution?
the code is
await using (var producerClient = new EventHubProducerClient(Settings.EventHubsConString, eventHubName))
{
// Create a batch of events
using EventDataBatch eventBatch = await producerClient.CreateBatchAsync();
// Add events to the batch. An event is a represented by a collection of bytes and metadata.
eventBatch.TryAdd(new EventData(Encoding.UTF8.GetBytes(message)));
// Use the producer client to send the batch of events to the event hub
await producerClient.SendAsync(eventBatch);
}
Again, this is a DNS resolution issue. It is nothing to do with your code or the Event Hubs SDK. DNS resolution happens in the .NET CLR.
Can you nslookup EH hostname on the VM where client failed? See if nslookup resolves to an IP.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(204.8, 44%, 29%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESS%3C/text%3E%3C/svg%3E)
@栋 郭 Please let us know if your issue is resolved ?