---
title: "WIZ1xxR Configuration tool error 10048, address in use"
url: "https://maker.wiznet.io/forum/14391"
markdown_url: "https://maker.wiznet.io/forum/14391/md"
type: "Forum topic"
category: "Serial-to-Ethernet & ConfigTool"
author: "elninio9"
created: "2021-11-09T07:06:27+09:00"
last_activity: "2021-11-10T07:03:26+09:00"
language: "en"
views: 905
replies: 2
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# WIZ1xxR Configuration tool error 10048, address in use

## Question

Asked by elninio9 on 2021-11-09 in Serial-to-Ethernet & ConfigTool.

Trying to connect WIZ1xxR Configuration tool to WIZ105SR . On Application start i get ‘Runtime error 10048’ address in use’ pop up alarm, Anyone have any idea why? Any help or guidance is appreciated.

## Replies

### Reply 1 by rena, 2021-11-09

Hi [@elninio9](https://maker.wiznet.io/u/elninio9),

The problem occurs when the port used by the Config tool is already in use by the host system.
Please refer to the below link.

- [Start of the Config tool - #2 by Jim](https://forum.wiznet.io/t/topic/1634/2)

- [\[WIZ1xxSR\] 10048 runtime error occurs when running Configuration Tool](https://forum.wiznet.io/t/topic/9242)

Thanks.

### Reply 2 by elninio9, 2021-11-10 (in reply to reply 1)

Hi , Thanks very much for the help. It turns out that NI Labview ties up the port on startup. All fixed now.

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Source: https://maker.wiznet.io/forum/14391