Re: ssh/scp sometimes unable to connect

[Corinna Vinschen <corinna-cygwin at cygwin dot com>]

On Jan 19 16:31, Ryan Johnson wrote:
> Hi all,
> 
> I just re-ran setup.exe yesterday and now ssh behaves erratically,
> often timing out instead of asking for a password:
> >$ ssh cs.utoroto.ca
> >ssh: connect to host cs.utoroto.ca port 22: Connection timed out
> 
> I rebased my system after the update and replaced the 13 Nov
> snapshot I've been using with the one from 11 Jan, but the problem
> persists. This doesn't seem to be fork-related in any obvious way:
> ssh runs but then times out on an fcntl syscall (see attached
> strace.out).
> 
> Normally I'd blame the network or the host, but sysadmins for the
> machine are unaware of anything that might cause the problem; I can
> maintain an open ssh connection to that host (cpu and memory usage
> there are both low) and can connect to it from other terminals
> windows during the failing attempt, which suggests the problem is on
> my side of the network. Even more strangely, changing things (ssh
> instead of scp, different user name, different host alias) makes it
> work or not (and, of course, sometimes it just works). Running
> strace or not doesn't seem to make a difference, though.

There's nothing weird in the strace.  Your connect call gets a WinSock
error 10060, WSAETIMEDOUT, that's all.  There were no changes to the
connect call since May 2011.  At this point, not even the new OpenSSL
0.9.8t should be involved.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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