FW: X forward question

Larry Hall (Cygwin X) reply-to-list-only-lh-x@cygwin.com
Mon Aug 20 02:36:00 GMT 2007

liang wrote:
> From: liang [mailto:swang2000@gmail.com] 
> Sent: Sunday, August 19, 2007 3:40 PM
> To: 'cygwin-xfree@cygwin.com'
> Subject: X forward question
> Hi, 
> 1. I just to subscribe the mailing list, so I can reply the email now. Sorry
> to start a new thread.
> 2. I start x server with double click startxwin.bat under /etc/x11r/bin, a
> window starts and X show in the system tray.
> 3. I typed xterm& and start a new window
> 4. In new window, I typed ssh –Y –v –l  ZwLi  (internal
> network, wireless)
>           $    ssh -Y -v -l ZwLi
> OpenSSH_4.6p1, OpenSSL 0.9.8e 23 Feb 2007
> debug1: Connecting to [] port 22.
> debug1: Connection established.
> debug1: identity file /home/swang/.ssh/identity type -1
> debug1: identity file /home/swang/.ssh/id_rsa type -1
> debug1: identity file /home/swang/.ssh/id_dsa type -1
> debug1: Remote protocol version 1.99, remote software version OpenSSH_4.6
> debug1: match: OpenSSH_4.6 pat OpenSSH*
> debug1: Enabling compatibility mode for protocol 2.0
> debug1: Local version string SSH-2.0-OpenSSH_4.6
> debug1: SSH2_MSG_KEXINIT sent
> debug1: SSH2_MSG_KEXINIT received
> debug1: kex: server->client aes128-cbc hmac-md5 none
> debug1: kex: client->server aes128-cbc hmac-md5 none
> debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
> debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
> debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
> debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
> debug1: Host '' is known and matches the RSA host key.
> debug1: Found key in /home/swang/.ssh/known_hosts:1
> debug1: ssh_rsa_verify: signature correct
> debug1: SSH2_MSG_NEWKEYS sent
> debug1: expecting SSH2_MSG_NEWKEYS
> debug1: SSH2_MSG_NEWKEYS received
> debug1: SSH2_MSG_SERVICE_ACCEPT received
> debug1: Authentications that can continue: publickey,password
> debug1: Next authentication method: publickey
> debug1: Trying private key: /home/swang/.ssh/identity
> debug1: Trying private key: /home/swang/.ssh/id_rsa
> debug1: Trying private key: /home/swang/.ssh/id_dsa
> debug1: Next authentication method: password
> ZwLi@'s password: 
> debug1: Authentication succeeded (password).
> debug1: channel 0: new [client-session]
> debug1: Entering interactive session.
> Warning: No xauth data; using fake authentication data for X11 forwarding.
> debug1: Requesting X11 forwarding with authentication spoofing.
> Last login: Sun Aug 19 15:05:49 2007 from unc-zofo4lkabzt
> ZwLi@duke-q49pd6smvo ~
> $
> 5. I believe that I logged on the sshd server on ZwLi computer.
> 6. Typed cd /cygdrive/c/program\ files/picasa2 to change folder on the
> server
> 7. Typed ./picasa2.exe and tried to run picasa to test if X forwarding is
> working
> 8. I can see the picasa2.exe running on my sshd server since I can see a
> process running in the windows task manager on the server. But there is
> nothing happened in my ssh client end.
> Do I suppose to see a picasa2 window opened in ssh client end? 

No.  You're running a MS Windows program that knows nothing about X.
Cygwin's X server will not magically transform the output of Windows
programs into X windows locally or otherwise.

> 9. Before I started my ssh session, I typed display=localhost:0.0    
>                                                    Export display after I
> started X server

Don't do this.  It's not needed and it's not correct.

> 10. My sshd server and client are both running on XP professional
> 11. I desparately need to run Rgui on my sshd server from ssh client. I
> didn’t install X server on the computer running sshd server.
> Do I miss something? Or I am totally wrong. My goal is to run windows
> application on the sshd server from every ssh client (both sshd server and
> ssh client installed XP).

See above.

> 12. I replaced “#X11forward no” with “X11forward yes” in the file
> sshd_config on sshd server. But I didn’t revise ssh_config  on the ssh
> client machine since I cannot find the file ssh_config under /etc/ folder.
> Please give me some helps. And thank everybody who replyed my email before.

I think you're looking at the wrong software to solve your problem.  If you
just want to run Windows programs on other machines, you can always
try connecting to a shared drive on the server and running the installed
program from the client.  But you're not going to find Cygwin X helps you
do this.

Larry Hall                              http://www.rfk.com
RFK Partners, Inc.                      (508) 893-9779 - RFK Office
216 Dalton Rd.                          (508) 429-6305 - FAX
Holliston, MA 01746

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