---
title: "WIZ550S2E UDP socket close error"
url: "https://maker.wiznet.io/forum/12537"
markdown_url: "https://maker.wiznet.io/forum/12537/md"
type: "Forum topic"
category: "Serial-to-Ethernet & ConfigTool"
author: "Alex Ponomarenko"
created: "2017-10-28T22:21:50+09:00"
last_activity: "2018-02-19T04:46:29+09:00"
language: "en"
views: 773
replies: 1
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# WIZ550S2E UDP socket close error

## Question

Asked by Alex Ponomarenko on 2017-10-28 in Serial-to-Ethernet & ConfigTool.

Since the version 1.1.0 I encountered such a problem:
AT > [S]
AT+MSTAT > [S,1.1.2]
AT+NSET=S,192.168.1.184,255.255.255.0,192.168.1.1,192.168.1.1 > [S]
AT+NOPEN=U,6102 > [S,0]
AT+NSEND=0,9,255.255.255.255,6100 xxxxxxxxx > [W,0] mis [S,0] !!!
AT+NCLOSE=0 > [F,7]

I noticed that in the new version in function sendto file socket.c the string was deleted:
if( (sock_io_mode & (1<<sn)) ) return SOCK_BUSY;

When I returned the string, the error disappeared:
…
AT+NSEND=0,9,255.255.255.255,6100 xxxxxxxxx > [W,0] [S,0]
AT+NCLOSE=0 > [S]

## Replies

### Reply 1 by Ricky, 2018-02-19

Thanks.
I will fix the problem.

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Source: https://maker.wiznet.io/forum/12537