---
title: "TCP not established"
url: "https://maker.wiznet.io/forum/10126"
markdown_url: "https://maker.wiznet.io/forum/10126/md"
type: "Forum topic"
category: "IO Modules"
author: "mcu10ver"
created: "2014-04-08T23:18:14+09:00"
last_activity: "2017-05-04T08:32:33+09:00"
language: "en"
views: 1819
replies: 1
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# TCP not established

## Question

Asked by mcu10ver on 2014-04-08 in IO Modules.

Hi,

I test Wiz820io TCP client mode connect to PC.
My config

GW = 192.168.1.1 (Router IP Address)
MAC = 00:00:55:55:AA:AA
IP = 192.168.1.15
Subnet = 255.255.255.0

Socket connect to
IP = 192.168.1.13
Subnet = 255.255.255.0
Port = 55057

When send CR = 1, socket status change from SOCK_INIT to SOCK_CLOSE_WAIT
and automatic change to SOCK_CLOSE.

Result packet monitor by wireshark is attach.

How to fix this problem ?.
Thanks in advance

[![](https://maker.wiznet.io/forum_uploads/wiznet/original/1X/36eb778b6df751515fbff95a619aa5a95a2d1a0b.png) 1052×206 16.6 KB](https://maker.wiznet.io/forum_uploads/wiznet/original/1X/36eb778b6df751515fbff95a619aa5a95a2d1a0b.png)

## Replies

### Reply 1 by mcu10ver, 2014-04-24

Hi midnightcow,

Problem is fix.
Program on PC that use for TCP server have some problem.
For test TCP connect to FileZilla FTP server is work correctly.

Thank you.

---

Source: https://maker.wiznet.io/forum/10126