diff --git a/nvflare/fuel/f3/streaming/blob_streamer.py b/nvflare/fuel/f3/streaming/blob_streamer.py
index e3ba9ab11c..282d8e8050 100644
--- a/nvflare/fuel/f3/streaming/blob_streamer.py
+++ b/nvflare/fuel/f3/streaming/blob_streamer.py
@@ -111,14 +111,17 @@ def _read_stream(blob_task: BlobTask):
                 length = len(buf)
                 try:
                     if blob_task.pre_allocated:
-                        blob_task.buffer[buf_size : buf_size + length] = buf
+                        remaining = len(blob_task.buffer) - buf_size
+                        if length > remaining:
+                            log.error(f"Buffer overrun: {remaining=} {length=} {buf_size=}")
+                            if remaining > 0:
+                                blob_task.buffer[buf_size : buf_size + remaining] = buf[0:remaining]
+                        else:
+                            blob_task.buffer[buf_size : buf_size + length] = buf
                     else:
                         blob_task.buffer.append(buf)
                 except Exception as ex:
-                    log.error(
-                        f"memory view error: {ex} "
-                        f"Debug info: {length=} {buf_size=} {len(blob_task.pre_allocated)=} {type(buf)=}"
-                    )
+                    log.error(f"memory view error: {ex} Debug info: {length=} {buf_size=} {type(buf)=}")
                     raise ex
 
                 buf_size += length
diff --git a/nvflare/fuel/f3/streaming/byte_receiver.py b/nvflare/fuel/f3/streaming/byte_receiver.py
index 08a815ca38..a9309bc030 100644
--- a/nvflare/fuel/f3/streaming/byte_receiver.py
+++ b/nvflare/fuel/f3/streaming/byte_receiver.py
@@ -14,7 +14,7 @@
 import logging
 import threading
 from collections import deque
-from typing import Callable, Dict, Tuple
+from typing import Callable, Dict, Optional, Tuple
 
 from nvflare.fuel.f3.cellnet.core_cell import CoreCell
 from nvflare.fuel.f3.cellnet.defs import MessageHeaderKey
@@ -41,6 +41,9 @@
 ACK_INTERVAL = 1024 * 1024 * 4
 READ_TIMEOUT = 300
 COUNTER_NAME_RECEIVED = "received"
+RESULT_DATA = 0
+RESULT_WAIT = 1
+RESULT_EOS = 2
 
 
 class RxTask:
@@ -78,30 +81,44 @@ def __init__(self, byte_receiver: "ByteReceiver", task: RxTask):
         super().__init__(task.size, task.headers)
         self.byte_receiver = byte_receiver
         self.task = task
+        self.timeout = CommConfigurator().get_streaming_read_timeout(READ_TIMEOUT)
+        self.ack_interval = CommConfigurator().get_streaming_ack_interval(ACK_INTERVAL)
 
     def read(self, chunk_size: int) -> bytes:
         if self.closed:
             raise StreamError("Read from closed stream")
 
-        if (not self.task.buffers) and self.task.eos:
-            return EOS
-
-        # Block if buffers are empty
         count = 0
-        while not self.task.buffers:
+        while True:
+            result_code, result = self._read_chunk(chunk_size)
+            if result_code == RESULT_EOS:
+                return EOS
+            elif result_code == RESULT_DATA:
+                return result
+
+            # Block if buffers are empty
             if count > 0:
-                log.debug(f"Read block is unblocked multiple times: {count}")
+                log.warning(f"Read block is unblocked multiple times: {count}")
 
             self.task.waiter.clear()
-            timeout = CommConfigurator().get_streaming_read_timeout(READ_TIMEOUT)
-            if not self.task.waiter.wait(timeout):
-                error = StreamError(f"{self.task} read timed out after {timeout} seconds")
+
+            if not self.task.waiter.wait(self.timeout):
+                error = StreamError(f"{self.task} read timed out after {self.timeout} seconds")
                 self.byte_receiver.stop_task(self.task, error)
                 raise error
 
             count += 1
 
+    def _read_chunk(self, chunk_size: int) -> Tuple[int, Optional[BytesAlike]]:
+
         with self.task.task_lock:
+
+            if not self.task.buffers:
+                if self.task.eos:
+                    return RESULT_EOS, None
+                else:
+                    return RESULT_WAIT, None
+
             last_chunk, buf = self.task.buffers.popleft()
             if buf is None:
                 buf = bytes(0)
@@ -117,8 +134,7 @@ def read(self, chunk_size: int) -> bytes:
 
             self.task.offset += len(result)
 
-            ack_interval = CommConfigurator().get_streaming_ack_interval(ACK_INTERVAL)
-            if not self.task.last_chunk_received and (self.task.offset - self.task.offset_ack > ack_interval):
+            if not self.task.last_chunk_received and (self.task.offset - self.task.offset_ack > self.ack_interval):
                 # Send ACK
                 message = Message()
                 message.add_headers(
@@ -133,7 +149,7 @@ def read(self, chunk_size: int) -> bytes:
 
             self.task.stream_future.set_progress(self.task.offset)
 
-            return result
+            return RESULT_DATA, result
 
     def close(self):
         if not self.task.stream_future.done():
@@ -148,6 +164,7 @@ def __init__(self, cell: CoreCell):
         self.registry = Registry()
         self.rx_task_map = {}
         self.map_lock = threading.Lock()
+        self.max_out_seq = CommConfigurator().get_streaming_max_out_seq_chunks(MAX_OUT_SEQ_CHUNKS)
 
         self.received_stream_counter_pool = StatsPoolManager.add_counter_pool(
             name="Received_Stream_Counters",
@@ -254,6 +271,10 @@ def _data_handler(self, message: Message):
             if last_chunk:
                 task.last_chunk_received = True
 
+            if seq < task.next_seq:
+                log.warning(f"{task} Duplicate chunk ignored {seq=}")
+                return
+
             if seq == task.next_seq:
                 self._append(task, (last_chunk, payload))
                 task.next_seq += 1
@@ -266,8 +287,7 @@ def _data_handler(self, message: Message):
 
             else:
                 # Out-of-seq chunk reassembly
-                max_out_seq = CommConfigurator().get_streaming_max_out_seq_chunks(MAX_OUT_SEQ_CHUNKS)
-                if len(task.out_seq_buffers) >= max_out_seq:
+                if len(task.out_seq_buffers) >= self.max_out_seq:
                     self.stop_task(task, StreamError(f"Too many out-of-sequence chunks: {len(task.out_seq_buffers)}"))
                     return
                 else:
@@ -294,7 +314,10 @@ def _append(task: RxTask, buf: Tuple[bool, BytesAlike]):
         if not buf:
             return
 
-        task.buffers.append(buf)
+        if task.eos:
+            log.error(f"{task} Data after EOS is ignored")
+        else:
+            task.buffers.append(buf)
 
         # Wake up blocking read()
         if not task.waiter.is_set():