diff --git a/sdk/core/azure-core/CHANGELOG.md b/sdk/core/azure-core/CHANGELOG.md
index 508e9f35bad1..dbd114975faa 100644
--- a/sdk/core/azure-core/CHANGELOG.md
+++ b/sdk/core/azure-core/CHANGELOG.md
@@ -3,6 +3,9 @@
 
 ## 1.5.1 (Unreleased)
 
+### Bug fixes
+
+- Fix AttributeException in StreamDownloadGenerator #11462
 
 ## 1.5.0 (2020-05-04)
 
diff --git a/sdk/core/azure-core/azure/core/pipeline/transport/_aiohttp.py b/sdk/core/azure-core/azure/core/pipeline/transport/_aiohttp.py
index 0f064e618f23..9b0089401513 100644
--- a/sdk/core/azure-core/azure/core/pipeline/transport/_aiohttp.py
+++ b/sdk/core/azure-core/azure/core/pipeline/transport/_aiohttp.py
@@ -234,12 +234,12 @@ async def __anext__(self):
                 else:
                     await asyncio.sleep(retry_interval)
                     headers = {'range': 'bytes=' + str(self.downloaded) + '-'}
-                    resp = self.pipeline.run(self.request, stream=True, headers=headers)
-                    if resp.status_code == 416:
+                    resp = await self.pipeline.run(self.request, stream=True, headers=headers)
+                    if resp.http_response.status_code == 416:
                         raise
                     chunk = await self.response.internal_response.content.read(self.block_size)
                     if not chunk:
-                        raise StopIteration()
+                        raise StopAsyncIteration()
                     self.downloaded += len(chunk)
                     return chunk
                 continue
diff --git a/sdk/core/azure-core/azure/core/pipeline/transport/_base.py b/sdk/core/azure-core/azure/core/pipeline/transport/_base.py
index 33d924a4004d..d8f82b34f4da 100644
--- a/sdk/core/azure-core/azure/core/pipeline/transport/_base.py
+++ b/sdk/core/azure-core/azure/core/pipeline/transport/_base.py
@@ -175,13 +175,13 @@ class HttpTransport(
 
     @abc.abstractmethod
     def send(self, request, **kwargs):
-        # type: (PipelineRequest, Any) -> PipelineResponse
+        # type: (HTTPRequestType, Any) -> HTTPResponseType
         """Send the request using this HTTP sender.
 
         :param request: The pipeline request object
-        :type request: ~azure.core.pipeline.PipelineRequest
+        :type request: ~azure.core.transport.HTTPRequest
         :return: The pipeline response object.
-        :rtype: ~azure.core.pipeline.PipelineResponse
+        :rtype: ~azure.core.pipeline.transport.HttpResponse
         """
 
     @abc.abstractmethod
diff --git a/sdk/core/azure-core/azure/core/pipeline/transport/_base_async.py b/sdk/core/azure-core/azure/core/pipeline/transport/_base_async.py
index d79999ed6297..bfc51ef6109b 100644
--- a/sdk/core/azure-core/azure/core/pipeline/transport/_base_async.py
+++ b/sdk/core/azure-core/azure/core/pipeline/transport/_base_async.py
@@ -28,7 +28,7 @@
 import abc
 from collections.abc import AsyncIterator
 
-from typing import AsyncIterator as AsyncIteratorType, TypeVar, Generic
+from typing import AsyncIterator as AsyncIteratorType, TypeVar, Generic, Any
 from ._base import (
     _HttpResponseBase,
     _HttpClientTransportResponse,
diff --git a/sdk/core/azure-core/azure/core/pipeline/transport/_requests_basic.py b/sdk/core/azure-core/azure/core/pipeline/transport/_requests_basic.py
index 537f902ece3b..ea0e7b0e4c9c 100644
--- a/sdk/core/azure-core/azure/core/pipeline/transport/_requests_basic.py
+++ b/sdk/core/azure-core/azure/core/pipeline/transport/_requests_basic.py
@@ -137,7 +137,7 @@ def __next__(self):
                     time.sleep(retry_interval)
                     headers = {'range': 'bytes=' + str(self.downloaded) + '-'}
                     resp = self.pipeline.run(self.request, stream=True, headers=headers)
-                    if resp.status_code == 416:
+                    if resp.http_response.status_code == 416:
                         raise
                     chunk = next(self.iter_content_func)
                     if not chunk:
diff --git a/sdk/core/azure-core/tests/azure_core_asynctests/test_stream_generator.py b/sdk/core/azure-core/tests/azure_core_asynctests/test_stream_generator.py
new file mode 100644
index 000000000000..f7368159615f
--- /dev/null
+++ b/sdk/core/azure-core/tests/azure_core_asynctests/test_stream_generator.py
@@ -0,0 +1,107 @@
+# ------------------------------------
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
+# ------------------------------------
+from azure.core.pipeline.transport import (
+    HttpRequest,
+    AsyncHttpResponse,
+    AsyncHttpTransport,
+)
+from azure.core.pipeline import AsyncPipeline
+from azure.core.pipeline.transport._aiohttp import AioHttpStreamDownloadGenerator
+from unittest import mock
+import pytest
+
+@pytest.mark.asyncio
+async def test_connection_error_response():
+    class MockTransport(AsyncHttpTransport):
+        def __init__(self):
+            self._count = 0
+
+        async def __aexit__(self, exc_type, exc_val, exc_tb):
+            pass
+        async def close(self):
+            pass
+        async def open(self):
+            pass
+
+        async def send(self, request, **kwargs):
+            request = HttpRequest('GET', 'http://127.0.0.1/')
+            response = AsyncHttpResponse(request, None)
+            response.status_code = 200
+            return response
+
+    class MockContent():
+        def __init__(self):
+            self._first = True
+
+        async def read(self, block_size):
+            if self._first:
+                self._first = False
+                raise ConnectionError
+            return None
+
+    class MockInternalResponse():
+        def __init__(self):
+            self.headers = {}
+            self.content = MockContent()
+
+        async def close(self):
+            pass
+
+    class AsyncMock(mock.MagicMock):
+        async def __call__(self, *args, **kwargs):
+            return super(AsyncMock, self).__call__(*args, **kwargs)
+
+    http_request = HttpRequest('GET', 'http://127.0.0.1/')
+    pipeline = AsyncPipeline(MockTransport())
+    http_response = AsyncHttpResponse(http_request, None)
+    http_response.internal_response = MockInternalResponse()
+    stream = AioHttpStreamDownloadGenerator(pipeline, http_response)
+    with mock.patch('asyncio.sleep', new_callable=AsyncMock):
+        with pytest.raises(StopAsyncIteration):
+            await stream.__anext__()
+
+@pytest.mark.asyncio
+async def test_connection_error_416():
+    class MockTransport(AsyncHttpTransport):
+        def __init__(self):
+            self._count = 0
+
+        async def __aexit__(self, exc_type, exc_val, exc_tb):
+            pass
+        async def close(self):
+            pass
+        async def open(self):
+            pass
+
+        async def send(self, request, **kwargs):
+            request = HttpRequest('GET', 'http://127.0.0.1/')
+            response = AsyncHttpResponse(request, None)
+            response.status_code = 416
+            return response
+
+    class MockContent():
+        async def read(self, block_size):
+            raise ConnectionError
+
+    class MockInternalResponse():
+        def __init__(self):
+            self.headers = {}
+            self.content = MockContent()
+
+        async def close(self):
+            pass
+
+    class AsyncMock(mock.MagicMock):
+        async def __call__(self, *args, **kwargs):
+            return super(AsyncMock, self).__call__(*args, **kwargs)
+
+    http_request = HttpRequest('GET', 'http://127.0.0.1/')
+    pipeline = AsyncPipeline(MockTransport())
+    http_response = AsyncHttpResponse(http_request, None)
+    http_response.internal_response = MockInternalResponse()
+    stream = AioHttpStreamDownloadGenerator(pipeline, http_response)
+    with mock.patch('asyncio.sleep', new_callable=AsyncMock):
+        with pytest.raises(ConnectionError):
+            await stream.__anext__()
diff --git a/sdk/core/azure-core/tests/test_stream_generator.py b/sdk/core/azure-core/tests/test_stream_generator.py
new file mode 100644
index 000000000000..4f40bba885eb
--- /dev/null
+++ b/sdk/core/azure-core/tests/test_stream_generator.py
@@ -0,0 +1,101 @@
+# ------------------------------------
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
+# ------------------------------------
+import requests
+from azure.core.pipeline.transport import (
+    HttpRequest,
+    HttpResponse,
+    HttpTransport,
+)
+from azure.core.pipeline import Pipeline, PipelineResponse
+from azure.core.pipeline.transport._requests_basic import StreamDownloadGenerator
+try:
+    from unittest import mock
+except ImportError:
+    import mock
+import pytest
+
+def test_connection_error_response():
+    class MockTransport(HttpTransport):
+        def __init__(self):
+            self._count = 0
+
+        def __exit__(self, exc_type, exc_val, exc_tb):
+            pass
+        def close(self):
+            pass
+        def open(self):
+            pass
+
+        def send(self, request, **kwargs):
+            request = HttpRequest('GET', 'http://127.0.0.1/')
+            response = HttpResponse(request, None)
+            response.status_code = 200
+            return response
+
+        def next(self):
+            self.__next__()
+
+        def __next__(self):
+            if self._count == 0:
+                self._count += 1
+                raise requests.exceptions.ConnectionError
+
+    class MockInternalResponse():
+        def iter_content(self, block_size):
+            return MockTransport()
+
+        def close(self):
+            pass
+
+    http_request = HttpRequest('GET', 'http://127.0.0.1/')
+    pipeline = Pipeline(MockTransport())
+    http_response = HttpResponse(http_request, None)
+    http_response.internal_response = MockInternalResponse()
+    stream = StreamDownloadGenerator(pipeline, http_response)
+    with mock.patch('time.sleep', return_value=None):
+        with pytest.raises(StopIteration):
+            stream.__next__()
+
+def test_connection_error_416():
+    class MockTransport(HttpTransport):
+        def __init__(self):
+            self._count = 0
+
+        def __exit__(self, exc_type, exc_val, exc_tb):
+            pass
+        def close(self):
+            pass
+        def open(self):
+            pass
+
+        def send(self, request, **kwargs):
+            request = HttpRequest('GET', 'http://127.0.0.1/')
+            response = HttpResponse(request, None)
+            response.status_code = 416
+            return response
+
+        def next(self):
+            self.__next__()
+
+        def __next__(self):
+            if self._count == 0:
+                self._count += 1
+                raise requests.exceptions.ConnectionError
+
+    class MockInternalResponse():
+        def iter_content(self, block_size):
+            return MockTransport()
+
+        def close(self):
+            pass
+
+    http_request = HttpRequest('GET', 'http://127.0.0.1/')
+    pipeline = Pipeline(MockTransport())
+    http_response = HttpResponse(http_request, None)
+    http_response.internal_response = MockInternalResponse()
+    stream = StreamDownloadGenerator(pipeline, http_response)
+    with mock.patch('time.sleep', return_value=None):
+        with pytest.raises(requests.exceptions.ConnectionError):
+            stream.__next__()
\ No newline at end of file