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Re: ssh/scp sometimes unable to connect
On 20/01/2012 8:31 AM, Corinna Vinschen wrote:
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.
Grr. I tried to send a reply yesterday, but apparently the list bounced
it due to mime type text/html (why , Thunderbird, why???).
It was PEBCAK -- typing 'utoroto.ca' rather than 'utoronto.ca' --
compounded by the fact that ssh apparently reports DNS failures as if
they were merely connection timeouts.
Sorry for the false alarm.
Ryan
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