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From: =?utf-8?B?6auY6ZSL?= <gao_feng@139.com>
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Subject: reply: problem with nc 1.107-4
Date: Thu, 30 Mar 2017 14:28:04 +0800
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Two days ago,i wanted to determine whether a udp port of another machine is open or not, which is deployed on different subnet.
But windows platform does not provide utility that can dose this.So i downloaded a setup.exe from cygwin,of which version is 2.877(64 bit),and i had never use this utility before.
-----邮件原件-----
发件人: cygwin-owner@cygwin.com [mailto:cygwin-owner@cygwin.com] 代表 Michael Enright
发送时间: 2017年3月30日 12:30
收件人: cygwin@cygwin.com
主题: Re: problem with nc 1.107-4

On Wed, Mar 29, 2017 at 7:24 PM, 高锋  wrote:
> I just installed the latest nc 1.107-4 on windows 7 platform.When 
> lauched the command like:
> nc -vuz 10.31.28.188 6110
> ,each time it reported connecting successed,even if the target ip
> 10.31.28.188 does not really exists.
> Could someone tell what wrong with me?
>

It's possible that you are accustomed to using, or using a script written for, the 'nc' command that was included in the 'netcat'
package, which was superceded in Cygwin some years ago. This could have happened if you were using Cygwin 1.7 (I think) and then upgraded to a brand new version of Cygwin. It is common, in my experience, that someone would have installed an old version of Cygwin, used it for years, and then upgraded to a new version.

Message from Vinschen about this change:
https://cygwin.com/ml/cygwin-announce/2012-05/msg00015.html

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