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From:	madhu gupta <m DOT gupta60 AT gmail DOT com>
Date:	Thu, 19 Jul 2018 10:34:47 +0600
Message-ID:	<CAAAgaWF9cR2TXJEB_86AQ3hrsvwhNZwwgCxs+daC1P+=2uVv=g@mail.gmail.com>
Subject:	Re: sshd service removed by Windows 10 update 1803
To:	cygwin AT cygwin DOT com
X-IsSubscribed:	yes

Thanks.

On Thu, Jul 19, 2018 at 5:51 AM, Cliff Geschke <
cliff DOT geschke AT preciseautomation DOT com> wrote:

> As part of a Windows 10 update 1803 a few days ago, the cygwin sshd
> service was
> removed, keeping my users from accessing my server.  I had been
> successfully
> using sshd for several years and it has survived numerous windows updates.
>
> Here is what I have done to fix it:
>
> Disable the following services via W10 computer management.
>   OpenSSH Authentication Agent
>   SSH Server Broker
>   SSH Server Proxy
>   SSHdBroker
>
> I'm not sure all those need to be disabled.
>
> Run a bash shell as administrator, and reinstall sshd using cygrunsrv
>
> cygrunsrv --stop sshd
> cygrunsrv --remove sshd
> cygrunsrv --install sshd --path /usr/sbin/sshd.exe --user cyg_server
> cygrunsrv --start sshd
>
> You will get an error from the start command:
>   cygrunsrv: Error starting a service: QueryServiceStatus:  Win32 error
> 1062:
>   The service has not been started.
>
> The task manager shows sshd is indeed running, and remote ssh clients can
> log
> in.  So I am ignoring the error.
>
> cygrunsrv -Q sshd shows the service is stopped.  And W10 computer
> management
> shows it is stopped.  If you try to start it again, it will fail because
> the
> sshd task has a hold on the TCP ports.  If you want to stop/restart to edit
> config files, you need to directly kill the sshd task.
>
> After a system restart, W10 starts the correct sshd again.
>
> Simply using "cygrunsrv --install sshd" without --path, installs the MS
> sshd.
> Not what I want.
>
> If you don't specify --user with the --install, W10 will use SYSTEM which
> does
> not have the permissions (SeTcbPrivilege etc) to change to the client
> user.  So
> you get seteuid Operation Not Permitted errors when a remote client tries
> and
> fails to login.  I discovered this the hard way.
>
> BTW, I didn't want to start over with ssh-host-config because I didn't
> want to
> risk invalidating my encryption keys and confuse my remote clients.
>
> Except for the weirdness where computer management and cygrunsrv -Q show
> the
> service is stopped, everything seems to work okay and my users are happy
> again.
>
> Cliff Geschke
> Precise Automation
>
>
>
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