Error Receive Partial Expedited 709 (0x2C5): How to Fix it

To fix this, adjust the code so it can handle partial data

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ERROR_RECEIVE_PARTIAL_EXPEDITED
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If you’re a network administrator, you might’ve encountered an ERROR_RECEIVE_PARTIAL_EXPEDITED error before. In today’s guide, we’re going to show you how to fix this issue once and for all, so let’s get started.

How can I fix ERROR_RECEIVE_PARTIAL_EXPEDITED?

1. Add logic for handling partial data

  1. Open your code.
  2. Adjust it like this:
    received_data = b""
    while True:
        chunk = socket.recv(buffer_size)
        received_data += chunk
        if not chunk or end_of_message_detected(chunk):
            break
    process_data(received_data)

    receive data
  3. Save changes.

By using this logic, the application can handle partial data and wait for the remaining data to arrive.

2. Increase buffer size

  1. Open the code.
  2. Next, adjust it like this: socket.setsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF, new_buffer_size)
    socket buffer size
  3. Save changes.

3. Enable TCP_NODELAY and review timeouts

  1. In your code, add the following: socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
    tcp_nodelay
  2. This will disable Nagle’s algorithm and reduce latency. Note that this works if you’re using TCP.
  3. Next, locate any timeouts in the application, and adjust them to allow the remaining data to arrive: socket.settimeout(5)

4. Other tips to try

  1. Check the network stability. You can use commands such as ping or traceroute to do so.
  2. Use packet capture tools to inspect how the expedited data is being transmitted and received. You can use Wireshark or tcpdump for this purpose.
  3. Ensure that both the client and the server follow the same protocol for sending and receiving data.
  4. Try to replicate the issue in a local environment and determine if the issue is related to application logic, network, or protocol.

It’s worth mentioning that ERROR_RECEIVE_PARTIAL_EXPEDITED also comes with 709 (0x2C5) {Partial Expedited Data Received} The network transport returned partial data to its client and this data was marked as expedited by the remote system message.

In most cases, you should be able to fix it by adjusting the buffer size or by handling the partial data properly.

Before you leave, don’t miss our guide on ERROR_RECEIVE_PARTIAL and ERROR_SIGNAL_REFUSED for more information.

We also have a guide on Error_Nointerface code, so you might want to check it out for more information.

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