sshd issues on Windows 10 version 1803

Corinna Vinschen
Mon Jun 25 13:12:00 GMT 2018

On Jun 22 11:27, Hiya Z wrote:
> Hello,
> Now that Microsoft has bundled OpenSSH for Windows in update 1803 (see
> here are some observations and the resulting unfortunate behavior:
> -  On a clean vanilla 1803 install, even with Windows Subsystem for Linux
> (WSL) not installed, there exists a folder %SystemRoot%\system32\openssh
> that has native Windows ssh and sshd executables.
> -  %SystemRoot%\system32\openssh is added to the system PATH.
> -  a (manual start) service "sshd", displayname="OpenSSH SSH Server",
> imagepath=%SystemRoot%\system32\openssh\sshd.exe, gets created.
> All of the above have the unfortunate consequence that Cygwin sshd no
> longer works reliably on a 1803 install. First, the service name "sshd"
> conflicts. This can be worked around by something like "ssh-host-config -N
> cygwinsshd". Even then, the Cygwin sshd does not always automatically start
> upon reboot. The Windows sshd is not configured/running, so there should
> not be a port conflict. SCM reports timeouts (waiting for cygwinsshd to
> respond) in the event viewer. A manual "sc start cygwinsshd" works, but
> again, upon the next reboot, the problem is back.
> There are other permutations depending on the sequence of install. If I
> were to upgrade a Windows 10 1709 node with a working Cygwin sshd, it seems
> that the 1803 update detects an existing sshd registry key (which really is
> Cygwin), does not clobber the registry keys, nor does it install sshd.exe
> under %SystemRoot%\system32\openssh (though ssh.exe and family get
> installed). Even on this node, the Cygwin sshd shows the same issue of not
> autostarting reliably upon reboots.
> I am not sure what Cygwin can do... but reporting this issue to see if
> Cygwin sshd can be fixed to autostart reliably upon reboots. As a minimum,
> the default service name in ssh-host-config should be changed to not
> collide with Windows "sshd".

There's also the problem that %SystemRoot%\System32\OpenSSH is now in
%Path% by default.  Very nice of MIcrosoft to just overload the service
name used by Cygwin for ages :(


Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat
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