Mail Archives: cygwin/2004/11/15/15:03:26
Igor Pechtchanski wrote:
> On Fri, 12 Nov 2004, Nicholas Wisniewski wrote:
>
>> Hello,
>> I'm trying ssh and tunnel to various machines. I can ssh just fine
>> without tunnelling (i.e. ssh user AT machine DOT net). When I try to tell ssh
>> to tunnel (ssh -X user AT machine DOT net), it prompts me for my password, and
>> then hangs.
>
>
> This is an X-related issue, and as such should go to the cygwin-xfree
> list. I'm redirecting my reply there -- please remove <cygwin at cygwin
> dot com> from further discussion.
I'm using Exceed as an X-windows client, not Xorg, so I don't think it
is. In any case, I thought that all ssh cared about was whether there
was a DISPLAY set or not.
>> When I look at the task manager, I see that sh.exe is taking up all of
>
> ^^^^^^
>
>> the available CPU. If I kill sh.exe from the task manager, ssh
>
> ^^^^^^
>
>> continues fine and I am connected and tunnelling.
>
>
> Is this really sh.exe? Can you check whether this sh.exe process is
> running before you start ssh (e.g., compare the outputs of "ps -ef" before
> and after "ssh -X")?
before
bash-2.05b$ ps -ef
UID PID PPID TTY STIME COMMAND
Nick 2888 1 con 13:34:32 /usr/bin/bash
Nick 4052 1 con 13:37:33 /usr/bin/bash
Nick 236 4052 con 13:39:22 /usr/bin/ps
after
bash-2.05b$ ps -ef
UID PID PPID TTY STIME COMMAND
Nick 2888 1 con 13:34:32 /usr/bin/bash
Nick 4052 1 con 13:37:33 /usr/bin/bash
Nick 3936 2888 con 13:40:16 /usr/bin/ssh
Nick 4012 3936 con 13:40:25 /usr/bin/sh
Nick 936 4052 con 13:40:29 /usr/bin/ps
> I don't recall any option that would make ssh start a shell on the local
> machine. Are your ssh config files customized? Are you running keychain,
> or autossh, or any other ssh-related scripts?
I just uninstalled everything. I reinstalled nothing but the default
packages and open-ssh. I'm running /usr/bin/ssh out of the box with no
modifications. As you can see from the ps, sh is being started by ssh.
As I mentioned before, if I kill sh.exe from the task manager,
everything works fine (i.e. it finishes logging in and I can display
things from the remote machine).
> Are you running Cygwin's ssh? Are you running /usr/bin/ssh, or is ssh
> aliased to anything? Is your DISPLAY set when you run ssh.exe? Have you
> tried trusted X forwarding ("ssh -Y")?
I'm running /usr/bin/ssh. ssh -Y has the same symptoms as ssh -X
bash-2.05b$ echo $DISPLAY
localhost:0.0
>> I'm running XP pro, service pack 2. I've turned off the XP firewall and
>> Sophos virus programs and still get the same behaviour. The same behavir
>> happens on this machine with cygwin 1.5.11 as well.
>>
>>
>> Has anybody ever seen this before?
>
>
> This doesn't sound like anything that's been reported before.
> Igor
Nick
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