---
title: "Ethernet Connection problem (HW Rev 1.2)"
url: "https://maker.wiznet.io/forum/13443"
markdown_url: "https://maker.wiznet.io/forum/13443/md"
type: "Forum topic"
category: "Serial-to-Ethernet & ConfigTool"
author: "ariep"
created: "2019-08-19T11:50:18+09:00"
last_activity: "2020-08-12T01:43:06+09:00"
language: "en"
views: 710
replies: 3
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# Ethernet Connection problem (HW Rev 1.2)

## Question

Asked by ariep on 2019-08-19 in Serial-to-Ethernet & ConfigTool.

Hello,

We are using the WIZ550S2E (HW Rev 1.1, SW Rev 1.0.3) in our product. Recently we’ve started using WIZ550S2E Rev 1.2 (with the same SW Rev. 1.0.3), but its Ethernel link stopped working (with same application); the Ethernet communication can’t be established and both PHY LED’s are OFF. When WIZ is replaced to previous HW Rev. 1.1 the problem disappears and it works OK once again. The WIZ in or system is connected to ETH/OP card that is OK, if connected directly to external switch. The new WIZ Rev 1.2 also works OK if connected directly to external switch. Voltage and other WIZ signals looks OK. Serial communication with WIZ is established and WIZ responds OK, except Ethernet.

Pls, advise what may be the problem. It looks that it is somehow related to the Rev. 1.2 HW changes.

Thanks,
Pasternak Arie.

## Replies

### Reply 1 by scott, 2019-08-20

Dear Ariep

Thank you for your questions. I’ll leave you an answer after checking it.

Thank you.

Scott

### Reply 2 by kneeld, 2020-08-10 (in reply to reply 1)

Hello,

We are experiencing a similar issue. We have been using firmware v1.03 with h/w v1.1 for several years. We recently received a new batch of WIZ550S2E modules that are hardware v1.2 and firmware v1.4. When we connect to the new 1.2 version on port 5000, it drops the connection after about 4 seconds. Please advise as to what is going on and how we can get the connection to stay open as it does in the V1.1 version.

Thanks,

Ken

### Reply 3 by viktor, 2020-08-12

Dear kneeld,

First of all, thanks for using our products!
Regarding your issue, would you mind to inform us what version of Config tool you are using?
Since you are using firmware v1.4, we recommend using latest version of config tool, which is available here: [GitHub - Wiznet/WIZnet_Configuration_Tool: This is WIZ550S2E & WIZ550web & WIZ550SR Configuration Tool](https://github.com/Wiznet/WIZnet_Configuration_Tool)

Should you have any questions, do not hesitate to contact us.

Thanks,
Viktor

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Source: https://maker.wiznet.io/forum/13443