diff --git a/app.py b/app.py
index ae409883..cb9377af 100644
--- a/app.py
+++ b/app.py
@@ -360,6 +360,18 @@ async def lifespan(app: FastAPI):
         eventManager.set_event_loop(main_loop)
         from modules.workflows.scheduler.mainScheduler import setMainLoop as setSchedulerMainLoop
         setSchedulerMainLoop(main_loop)
+
+        # Suppress noisy ConnectionResetError from ProactorEventLoop on Windows
+        # when clients (browsers) close connections abruptly. This is a known
+        # asyncio issue on Windows: https://bugs.python.org/issue39010
+        def _suppressClientDisconnect(loop, ctx):
+            exc = ctx.get("exception")
+            if isinstance(exc, ConnectionResetError):
+                return
+            if isinstance(exc, ConnectionAbortedError):
+                return
+            loop.default_exception_handler(ctx)
+        main_loop.set_exception_handler(_suppressClientDisconnect)
     except RuntimeError:
         pass
     eventManager.start()