EventHubProducerClient with custom_endpoint_address fails with: ErrorCodes.UnknownError: Connection in an unexpected error state.

• Package Name: azure.eventhub
• Package Version: azure_eventhub-5.10.1.dist-info
• Operating System: Linux or Windows
• Python Version: Python 3.10.7

Describe the bug

Running the following code sample:

from azure.eventhub import EventData, EventHubProducerClient, TransportType
from azure.identity import EnvironmentCredential

credential = EnvironmentCredential()

producer = EventHubProducerClient(
    fully_qualified_namespace="<evh namespace>", 
    eventhub_name="<evh name>",
    credential=credential,
    logging_enable=True,  # To enable network tracing log, set logging_enable to True.
    retry_total=0,  # Retry up to 3 times to re-do failed operations.
    custom_endpoint_address = "sb://<endpoint address>:5671")

with producer:
    event_data_batch = producer.create_batch()
    event_data_batch.add(EventData('Message inside EventBatchData'))
    producer.send_batch(event_data_batch)

print('Finished sending.')

Fails with the following message:

ConnectionClose('ErrorCodes.UnknownError: Connection in an unexpected error state.')
Traceback (most recent call last):
  File "C:\Users\azureadmin\AppData\Local\Programs\Python\Python310\lib\site-packages\azure\eventhub\_client_base.py", line 567, in _do_retryable_operation
    return operation()
  File "C:\Users\azureadmin\AppData\Local\Programs\Python\Python310\lib\site-packages\azure\eventhub\_client_base.py", line 526, in _open
    while not self._handler.client_ready():
  File "C:\Users\azureadmin\AppData\Local\Programs\Python\Python310\lib\site-packages\uamqp\client.py", line 385, in client_ready
    self._connection.work()
  File "C:\Users\azureadmin\AppData\Local\Programs\Python\Python310\lib\site-packages\uamqp\connection.py", line 252, in work
    raise self._error
uamqp.errors.ConnectionClose: ErrorCodes.UnknownError: Connection in an unexpected error state.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\azureadmin\Desktop\pysample\send.py", line 15, in <module>
    event_data_batch = producer.create_batch()
  File "C:\Users\azureadmin\AppData\Local\Programs\Python\Python310\lib\site-packages\azure\eventhub\_producer_client.py", line 714, in create_batch
    self._get_max_message_size()
  File "C:\Users\azureadmin\AppData\Local\Programs\Python\Python310\lib\site-packages\azure\eventhub\_producer_client.py", line 321, in _get_max_message_size
    )._open_with_retry()
  File "C:\Users\azureadmin\AppData\Local\Programs\Python\Python310\lib\site-packages\azure\eventhub\_producer.py", line 152, in _open_with_retry
    return self._do_retryable_operation(self._open, operation_need_param=False)
  File "C:\Users\azureadmin\AppData\Local\Programs\Python\Python310\lib\site-packages\azure\eventhub\_client_base.py", line 583, in _do_retryable_operation
    raise last_exception
azure.eventhub.exceptions.ConnectionLostError: Connection in an unexpected error state.
ErrorCodes.UnknownError: Connection in an unexpected error state.

Same thing happens if the custom endpoint is changed to https://<endpoint address>:443

Expected behavior Messages should flow to the Event Hub using a custom endpoint address for both AmqpWebSockets and AmqpTcp.

[l0lawrence]

Yes, we can definitely look into adding support for it over TCP. I have made an issue here: #26513 to track the progress.

[cmendible]

Will AmqpTcp be supported as other SDK’s such as .NET do?