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Subject:	Re: Issue running PowerShell code on Windows Machine from Linux machine using Cygwin
To:	cygwin AT cygwin DOT com
References:	<CAE=7pzxgiLTtoMSKe-9b8wffWH64biOp_QbEhDWNfgDiYg1SgA AT mail DOT gmail DOT com>
From:	john doe <johndoe65534 AT mail DOT com>
Message-ID:	<db034847-fe86-254a-0db2-0283b3f45ebf@mail.com>
Date:	Mon, 30 Jul 2018 19:30:53 +0200
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In-Reply-To:	<CAE=7pzxgiLTtoMSKe-9b8wffWH64biOp_QbEhDWNfgDiYg1SgA@mail.gmail.com>
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On 7/30/2018 1:20 PM, Shekhar Shukla wrote:
>   Hi Team,
> 
> I am having issue while establishing a ssh connection from Linux to Windows
> machine using Cygwin. My powershell script works when I run it from Linux
> using ssh connection(Cygwin) to Windows  and manually enter my passowrd.
> But whn I use public key to authenticate my user(making a password less
> connection), it fails. Is it a bug with CYgwin?
> 
> Below is the step by step explantion-
> 
> 
> 1. Sample
> Code
> I have put on Windows machine. This machine has Cygwin installed on it
> 
> +++++++++++++
> :
> +++++++++++
> 
> echo "Hello World!"
> import-module ActiveDirectory
> get-adcomputer -Filter * |select Name|select -first 10
> +++++++++++++++++++++++++
> 
> 
> 2. When I run
> this code
>   from Linux machine using Cygwin WITHOUT enabling password-less connection,
> It asks for password
> of Windows machine and after entering the password it
>   execute
> s
>   like a charm. See below-
> 
> +++++++++++++++++++++++
> 
> shekhar AT LinuxBox:~$ ssh shekhar AT WindowsBox DOT doamin DOT com 'powershell
> "C:/scripts/abc.ps1"'
> shekhar AT WindoxBox DOT domain DOT com's password:
> 
> Hello World!
> 
> Name
> ----
> Server1
> Server2
> Server3
> Server4
> 
> ++++++++++++++++++++++++
> 
> 3. Now I generate an ssh-key on Linux for user shekhar and copy it on
> Windows machine to make a password less connection.
> 
> ++++++++++++++++++++++++++++++
> 
> shekhar AT LinuxBox:~$ ssh-copy-id shekhar AT WindowsBox DOT doamin DOT com
> shekhar AT WindowsBox's password:
> Now try logging into the machine, with "ssh 'shekhar AT WindowsBox DOT domain DOT com'",
> and check in:
> 
>    .ssh/authorized_keys
> 
> to make sure we haven't added extra keys that you weren't expecting.
> ++++++++++++++++++++++++++++++++
> 
> 
> 4. Now I run the same script again. Now it doesn't asks a password makes a
> connection with Windows box and display Hello world(first line of code) but
> fails on the second line
> 
> +++++++++++++++
> 
> shekhar AT LinuxBox:~$ ssh shekhar AT WindoxBox DOT domain DOT com  'powershell
> "C:/scripts/abc.ps1"'
> Hello World!
> WARNING: Error initializing default drive: 'Unable to contact the server.
> This
> may be because this server does not exist, it is currently down, or it does
> not
>   have the Active Directory Web Services running.'.
> Get-ADComputer : Unable to contact the server. This may be because this
> server
> does not exist, it is currently down, or it does not have the Active
> Directory
> Web Services running.
> At C:\scripts\abc.ps1:3 char:15
> + get-adcomputer <<<<  -Filter * |select Name|select -first 10
>      + CategoryInfo          : ResourceUnavailable: (:) [Get-ADComputer],
> ADSer
>     verDownException
>      + FullyQualifiedErrorId : Unable to contact the server. This may be
> becaus
>     e this server does not exist, it is currently down, or it does not have
> th
>    e Active Directory Web Services running.,Microsoft.ActiveDirectory.Managem
>   ent.Commands.GetADComputer
> ++++++++++++++++++
> 

In ~/.ssh/authorized_keys you could try those options:

NO-PTY,NO-USER-RC ssh

EG: authorized_keys:
NO-PTY,NO-USER-RC ssh ...

https://www.ssh.com/ssh/authorized_keys/openssh

-- 
John Doe

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