Re: ssh session hangs while running cmd on remote server

[KenLee <Kenny_Lee at owfg dot com>]

I have tried ssh using both interactive and command line mode, and I get the
same results.  That is - sorry for being pedantic about this - I had invoked
ssh first with the command line option, and it worked.  I invoked ssh again
with the command line again, but it hung this time.  Then I just invoked ssh
on its own, and entered the commands one at a time, and it hung again.  

Then I ran cygwin directly on the remote server (thinking that it's the VB
script causing the problem), so I entered cmd /c update.kcu (without any
ssh) and it worked just fine.  

I checked the CYGWIN setting and it is set to CYGWIN=ntsec tty



Christopher Faylor-8 wrote:
> 
> On Thu, May 31, 2007 at 04:27:00PM -0400, Larry Hall (Cygwin) wrote:
>>Christopher Faylor wrote:
>>> There seems to be some confusion about the CYGWIN tty setting.
>>> 
>>> The only time it should have any effect is when there is a console
>>> involved.
>>> In that scenario, what effectively happens is that CYGWIN opens up a pty
>>> and pretends that the pty is a linux-like tty.
>>> 
>>> Setting CYGWIN=tty for servers should be a no-op.  Ditto, having it set
>>> while operating under a pty or if there is no console associated with
>>> the
>>> session.
>>> 
>>> So, if setting CYGWIN=tty actually causes a problem in an ssh session
>>> then that is probably a Cygwin bug.  Until that problem has become
>>> evident
>>> lets not assume that there is a problem.
>>> 
>>> I don't mean to be picking on you Larry.  You are not the only person
>>> I've seen opine about CYGWIN=tty .  I remain unconvinced that setting it
>>> would present a problem other than the standard problem of running pure
>>> Windows programs under a Cygwin pty.
>>
>>The confusion may come from me. ;-)
>>
>>So are you saying that all Cygwin services effectively use ptys?
>>
>>Rereading the original post, I note that KenLee only said 'cmd' was
started
>>once in the OpenSSH session.  I also assumed he invoked 'ssh' from a
>>console, which may make a difference if the answer to the above question
>>is "no".  But that assumption is unsubstantiated by the available
>>information. ;-)
> 
> If he ssh'ed to somewhere interactively then there is a pty involved on
> the remote end where the program was being run so that's what would have
> caused any problem, IMO, regardless of the CYGWIN tty setting on the
> local end.  In that scenario, since ssh is a cygwin program it shouldn't
> care about the CYGWIN=tty setting one way or the other.
> 
> cgf
> 
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