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Re: Windows Server 2012R2 64bit and 32bit Cygwin sshd

On Sep  4 11:23, Achim Gratz wrote:
> Corinna Vinschen <corinna-cygwin <at>> writes:
> > You already built your own Cygwin DLL, right?  What you could do is to
> > do some good old printf debugging.  First let's try to find out if it's
> > really one of the NetUser calls:
> It looks like I need to install more than the DLL to make this work?


> I couldn't start cygserver as a service with (just) the built DLL in place.

No idea why.  The patch just adds debug output to strace ouptput, nothing 

> So I started it in debug mode from the command line (which makes it have
> less rights than it needs) and started the sshd in debug mode also.

In a cyg_server GUI session?  If so, you should have all rights required
when starting this in an elevated shell.

> Due to
> presumably the missing rights mentioned I could only log in with an
> administrative account (domain account, but restricted to run on  the server
> only).  I didn't get any failure from the debug_printf instrumented
> functions.  With my normal user account I got a "/bin/bash: Operation not
> permitted".  The cygserver debug output also showed unfettered access to the
> AD.  With the sshd running without privilege separation I've noticed some
> requests to the cygserver that seemed to indicate memory corruption:  Early
> on in starting the daemon it would normally try to get account information
> for Administrators:544, but the debug output from cygserver was showing
> sshdrs as the account name being asked for.  Also there are (probably
> unrelated since they are also present on x86_64) complaints about requests
> of illegal length (11).

Ok, I don't grok this.  If you have trouble with cygserver, which is
completely unrelated to this issue, please discuss this in a new thread
and please describe detailed what you did to provoke the problem and
paste what you see.


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

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