---
title: "[From QnA]Multiple Clients & W7100"
url: "https://maker.wiznet.io/forum/9518"
markdown_url: "https://maker.wiznet.io/forum/9518/md"
type: "Forum topic"
category: "MCU & Boards"
author: "hjjeon0608"
created: "2013-09-09T09:45:42+09:00"
last_activity: "2017-05-04T08:29:56+09:00"
language: "en"
views: 679
replies: 1
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# [From QnA]Multiple Clients & W7100

## Question

Asked by hjjeon0608 on 2013-09-09 in MCU & Boards.

Hi,

I am developing a program for a control system using Arduino and Internet Shield with W7100 chip. My programm is written in c# and using the common libery (TcpClient) as communication interface. The program is work fine but if I try to connect the controller with multiple client simutantly (all client connect to the same server - same IP and same port-), only the first client can connect to server. As i see in the detial of W7100, it should be connected up to 8 sockets (= 8 clients?).

My Question :

- Is it possible for multiple clients to connect to the server at the same time?

- Do I have to set the socket number to make this situation possible? - if yes, how can I set it in c#?

Thanks,
zensuie

## Replies

### Reply 1 by hjjeon0608, 2013-09-09

Dear customer,
Thanks for your interest in W7100.

1. Yes, it is possible. 8 sockets = 8 clients, at least.

2. If you want to let 8 clients connect with W7100 simutantly,you must open 8 sockets before. Below code comes from our application note of W7100-based webserver. You can see how to listen the 8 sockets simutantly. As for c# and arduino, we are not experts, please find support from arduino website or other forum.

while (1)
{
ProcessWebSever(0);
ProcessWebSever(1);
ProcessWebSever(2);
ProcessWebSever(3);
ProcessWebSever(4);
ProcessWebSever(5);
ProcessWebSever(6);
ProcessWebSever(7);
}
Thanks.
WIZnet

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Source: https://maker.wiznet.io/forum/9518