diff --git a/tableauserverclient/server/endpoint/datasources_endpoint.py b/tableauserverclient/server/endpoint/datasources_endpoint.py
index 0fb5c7dc9..bac05461c 100644
--- a/tableauserverclient/server/endpoint/datasources_endpoint.py
+++ b/tableauserverclient/server/endpoint/datasources_endpoint.py
@@ -19,7 +19,12 @@
 
 from tableauserverclient.server.endpoint.dqw_endpoint import _DataQualityWarningEndpoint
 from tableauserverclient.server.endpoint.endpoint import QuerysetEndpoint, api, parameter_added_in
-from tableauserverclient.server.endpoint.exceptions import InternalServerError, MissingRequiredFieldError
+from tableauserverclient.server.endpoint.exceptions import (
+    DUPLICATE_EXTRACT_JOB_CODE,
+    InternalServerError,
+    MissingRequiredFieldError,
+    ServerResponseError,
+)
 from tableauserverclient.server.endpoint.permissions_endpoint import _PermissionsEndpoint
 from tableauserverclient.server.endpoint.resource_tagger import TaggingMixin
 
@@ -433,7 +438,7 @@ def update_connections(
         return connection_items
 
     @api(version="2.8")
-    def refresh(self, datasource_item: DatasourceItem | str, incremental: bool = False) -> JobItem:
+    def refresh(self, datasource_item: DatasourceItem | str, incremental: bool = False) -> JobItem | None:
         """
         Refreshes the extract of an existing workbook.
 
@@ -454,7 +459,13 @@ def refresh(self, datasource_item: DatasourceItem | str, incremental: bool = Fal
         id_ = getattr(datasource_item, "id", datasource_item)
         url = f"{self.baseurl}/{id_}/refresh"
         refresh_req = RequestFactory.Task.refresh_req(incremental, self.parent_srv)
-        server_response = self.post_request(url, refresh_req)
+        try:
+            server_response = self.post_request(url, refresh_req)
+        except ServerResponseError as e:
+            if e.code == DUPLICATE_EXTRACT_JOB_CODE:
+                logger.warning(f"{e.summary} {e.detail}")
+                return None
+            raise
         new_job = JobItem.from_response(server_response.content, self.parent_srv.namespace)[0]
         return new_job
 
diff --git a/tableauserverclient/server/endpoint/exceptions.py b/tableauserverclient/server/endpoint/exceptions.py
index 9d30ce331..154aa4549 100644
--- a/tableauserverclient/server/endpoint/exceptions.py
+++ b/tableauserverclient/server/endpoint/exceptions.py
@@ -1,6 +1,10 @@
 from defusedxml.ElementTree import fromstring
 from typing import TypeVar
 
+# Server error code for "extract refresh already queued" — treated as a
+# non-fatal warning rather than an exception in refresh() methods.
+DUPLICATE_EXTRACT_JOB_CODE = "409093"
+
 
 def split_pascal_case(s: str) -> str:
     return "".join([f" {c}" if c.isupper() else c for c in s]).strip()
diff --git a/tableauserverclient/server/endpoint/flows_endpoint.py b/tableauserverclient/server/endpoint/flows_endpoint.py
index 2d480e883..ea7b59526 100644
--- a/tableauserverclient/server/endpoint/flows_endpoint.py
+++ b/tableauserverclient/server/endpoint/flows_endpoint.py
@@ -10,7 +10,12 @@
 
 from tableauserverclient.server.endpoint.dqw_endpoint import _DataQualityWarningEndpoint
 from tableauserverclient.server.endpoint.endpoint import QuerysetEndpoint, api
-from tableauserverclient.server.endpoint.exceptions import InternalServerError, MissingRequiredFieldError
+from tableauserverclient.server.endpoint.exceptions import (
+    DUPLICATE_EXTRACT_JOB_CODE,
+    InternalServerError,
+    MissingRequiredFieldError,
+    ServerResponseError,
+)
 from tableauserverclient.server.endpoint.permissions_endpoint import _PermissionsEndpoint
 from tableauserverclient.server.endpoint.resource_tagger import _ResourceTagger, TaggingMixin
 from tableauserverclient.models import FlowItem, PaginationItem, ConnectionItem, JobItem
@@ -305,7 +310,7 @@ def update_connection(self, flow_item: FlowItem, connection_item: ConnectionItem
         return connection
 
     @api(version="3.3")
-    def refresh(self, flow_item: FlowItem | str) -> JobItem:
+    def refresh(self, flow_item: FlowItem | str) -> JobItem | None:
         """
         Runs the flow to refresh the data.
 
@@ -324,7 +329,13 @@ def refresh(self, flow_item: FlowItem | str) -> JobItem:
         flow_id = getattr(flow_item, "id", flow_item)
         url = f"{self.baseurl}/{flow_id}/run"
         empty_req = RequestFactory.Empty.empty_req()
-        server_response = self.post_request(url, empty_req)
+        try:
+            server_response = self.post_request(url, empty_req)
+        except ServerResponseError as e:
+            if e.code == DUPLICATE_EXTRACT_JOB_CODE:
+                logger.warning(f"{e.summary} {e.detail}")
+                return None
+            raise
         new_job = JobItem.from_response(server_response.content, self.parent_srv.namespace)[0]
         return new_job
 
diff --git a/tableauserverclient/server/endpoint/workbooks_endpoint.py b/tableauserverclient/server/endpoint/workbooks_endpoint.py
index ce605806f..d6d77e207 100644
--- a/tableauserverclient/server/endpoint/workbooks_endpoint.py
+++ b/tableauserverclient/server/endpoint/workbooks_endpoint.py
@@ -11,6 +11,7 @@
 
 from tableauserverclient.server.endpoint.endpoint import QuerysetEndpoint, api, parameter_added_in
 from tableauserverclient.server.endpoint.exceptions import (
+    DUPLICATE_EXTRACT_JOB_CODE,
     InternalServerError,
     MissingRequiredFieldError,
     ServerResponseError,
@@ -147,7 +148,7 @@ def refresh(self, workbook_item: WorkbookItem | str, incremental: bool = False)
         try:
             server_response = self.post_request(url, refresh_req)
         except ServerResponseError as e:
-            if e.code.startswith("409") and "already" in e.detail:
+            if e.code == DUPLICATE_EXTRACT_JOB_CODE:
                 logger.warning(f"{e.summary} {e.detail}")
                 return None
             raise
diff --git a/test/assets/datasource_refresh_duplicate.xml b/test/assets/datasource_refresh_duplicate.xml
new file mode 100644
index 000000000..38a258933
--- /dev/null
+++ b/test/assets/datasource_refresh_duplicate.xml
@@ -0,0 +1,3 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<tsResponse xmlns="http://tableau.com/api" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://tableau.com/api https://help.tableau.com/samples/en-us/rest_api/ts-api_3_27.xsd">
+<error code="409093"><summary>Resource Conflict</summary><detail>Job for \'extract\' is already queued. Not queuing a duplicate.</detail></error></tsResponse>
diff --git a/test/assets/flow_refresh_duplicate.xml b/test/assets/flow_refresh_duplicate.xml
new file mode 100644
index 000000000..38a258933
--- /dev/null
+++ b/test/assets/flow_refresh_duplicate.xml
@@ -0,0 +1,3 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<tsResponse xmlns="http://tableau.com/api" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://tableau.com/api https://help.tableau.com/samples/en-us/rest_api/ts-api_3_27.xsd">
+<error code="409093"><summary>Resource Conflict</summary><detail>Job for \'extract\' is already queued. Not queuing a duplicate.</detail></error></tsResponse>
diff --git a/test/test_datasource.py b/test/test_datasource.py
index cb1157bc5..4802c7d33 100644
--- a/test/test_datasource.py
+++ b/test/test_datasource.py
@@ -35,6 +35,7 @@
 UPDATE_CONNECTION_XML = TEST_ASSET_DIR / "datasource_connection_update.xml"
 UPDATE_CONNECTIONS_XML = TEST_ASSET_DIR / "datasource_connections_update.xml"
 UPDATE_CONNECTIONS_NO_AUTH_XML = TEST_ASSET_DIR / "datasource_connections_update_no_auth.xml"
+REFRESH_DUPLICATE_XML = TEST_ASSET_DIR / "datasource_refresh_duplicate.xml"
 
 
 @pytest.fixture(scope="function")
@@ -473,6 +474,19 @@ def test_refresh_object(server) -> None:
     assert "7c3d599e-949f-44c3-94a1-f30ba85757e4" == new_job.id
 
 
+def test_refresh_already_running(server) -> None:
+    server.version = "2.8"
+    response_xml = REFRESH_DUPLICATE_XML.read_text()
+    with requests_mock.mock() as m:
+        m.post(
+            server.datasources.baseurl + "/9dbd2263-16b5-46e1-9c43-a76bb8ab65fb/refresh",
+            status_code=409,
+            text=response_xml,
+        )
+        refresh_job = server.datasources.refresh("9dbd2263-16b5-46e1-9c43-a76bb8ab65fb")
+        assert refresh_job is None
+
+
 def test_datasource_refresh_request_empty(server) -> None:
     server.version = "2.8"
     item = TSC.DatasourceItem("")
diff --git a/test/test_flow.py b/test/test_flow.py
index 9ebbbe5d6..008c39a96 100644
--- a/test/test_flow.py
+++ b/test/test_flow.py
@@ -17,6 +17,7 @@
 PUBLISH_XML = TEST_ASSET_DIR / "flow_publish.xml"
 UPDATE_XML = TEST_ASSET_DIR / "flow_update.xml"
 REFRESH_XML = TEST_ASSET_DIR / "flow_refresh.xml"
+REFRESH_DUPLICATE_XML = TEST_ASSET_DIR / "flow_refresh_duplicate.xml"
 
 
 @pytest.fixture(scope="function")
@@ -232,6 +233,18 @@ def test_refresh_id_str(server: TSC.Server) -> None:
         assert format_datetime(refresh_job.flow_run.started_at) == "2018-05-22T13:00:29Z"
 
 
+def test_refresh_already_running(server: TSC.Server) -> None:
+    response_xml = REFRESH_DUPLICATE_XML.read_text()
+    with requests_mock.mock() as m:
+        m.post(
+            server.flows.baseurl + "/92967d2d-c7e2-46d0-8847-4802df58f484/run",
+            status_code=409,
+            text=response_xml,
+        )
+        refresh_job = server.flows.refresh("92967d2d-c7e2-46d0-8847-4802df58f484")
+        assert refresh_job is None
+
+
 def test_bad_download_response(server: TSC.Server) -> None:
     with requests_mock.mock() as m, tempfile.TemporaryDirectory() as td:
         m.get(