---
title: "Server side(PC) send FIN, ACK and RST to WIZ850io TCP Client"
url: "https://maker.wiznet.io/forum/15323"
markdown_url: "https://maker.wiznet.io/forum/15323/md"
type: "Forum topic"
category: "Serial-to-Ethernet & ConfigTool"
author: "AntonyHan"
created: "2024-10-22T23:00:06+09:00"
last_activity: "2024-10-22T23:00:06+09:00"
language: "en"
tags: ["W5500"]
views: 2
replies: 0
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# Server side(PC) send FIN, ACK and RST to WIZ850io TCP Client

## Question

Asked by AntonyHan on 2024-10-22 in Serial-to-Ethernet & ConfigTool.

I'm using wiz850io module to implement TCP Client function.

It connect TCP server program in my computer.

The problem is that the server(PC) send FIN, ACK right after communication completion.

I don't know why the server send that frame.

And I want to keep the communication.

Please comment me how to keep the connection between server and client.

![](https://maker.wiznet.io/upload/ckeditor5/915164673%5F1729637144%2Epng)

---

Source: https://maker.wiznet.io/forum/15323