"ssh -X" between FC4 and Solaris 9 not working

daihard · 07-12-2006, 10:05 AM

Hi.

I am trying to figure out why "ssh -X" does not work between my FC4 box (leo) and a Solaris 9 server (sparc-sf9). I can connect to it with the following command:

Code:

$ ssh -X sparc-sf9

But when I run a X app (such as "xterm") on the Solaris console, I get the following error:

Code:

xterm Xt error: Can't open display:

For some reason, DISPLAY is not set to point to "localhost:10.0" as should be the case with "ssh -X". So I manually set DISPLAY as "localhost:10.0". I still cannot open xterm on my FC4 box.

Code:

xterm Xt error: Can't open display: localhost:10.0

Could anyone educate me? Is there any particular component that must be installed on Solaris in order for "ssh -X" to work? Interestingly, "ssh -X" works perfectly with another Solaris machine we have, which is running Solaris 10.

NOTE: I did run "xhost +sparc-sf9" on FC4.

Any help would be appreciated.

Dai

macemoneta · 07-12-2006, 10:51 AM

Try 'ssh -Y' instead; it may be that the Solaris 9 machine is not using the X11 security controls.

jlliagre · 07-12-2006, 11:28 AM

Try "ssh -v -X sparc-sf9" to see what is negotiated.

"xhost +sparc-sf9" is unnecessary, and potentially risky.

daihard · 07-14-2006, 03:47 PM

Thanks for the response, guys.

First, "ssh -Y" did not work either. Second, I tried "ssh -V -x" to capture the verbose messeages. Here's what I got:

Code:

[leo.aaa.com:/home/dtoyama]$ ssh -v -X sparc-sf9
OpenSSH_4.2p1, OpenSSL 0.9.7f 22 Mar 2005
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to sparc-sf9 [198.206.247.6] port 22.
debug1: Connection established.
debug1: identity file /home/dtoyama/.ssh/identity type -1
debug1: identity file /home/dtoyama/.ssh/id_rsa type 1
debug1: identity file /home/dtoyama/.ssh/id_dsa type -1
debug1: Remote protocol version 2.0, remote software version Sun_SSH_1.0.1
debug1: match: Sun_SSH_1.0.1 pat Sun_SSH_1.0*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_4.2
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: sending SSH2_MSG_KEXDH_INIT
debug1: expecting SSH2_MSG_KEXDH_REPLY
debug1: Host 'sparc-sf9' is known and matches the RSA host key.
debug1: Found key in /home/dtoyama/.ssh/known_hosts:2
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_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password
debug1: Next authentication method: publickey
debug1: Trying private key: /home/dtoyama/.ssh/identity
debug1: Offering public key: /home/dtoyama/.ssh/id_rsa
debug1: Server accepts key: pkalg ssh-rsa blen 277
debug1: read PEM private key done: type RSA
debug1: Authentication succeeded (publickey).
debug1: channel 0: new [client-session]
debug1: Entering interactive session.
debug1: Requesting X11 forwarding with authentication spoofing.

Does this give you any clue? Thanks!

jlliagre · 07-14-2006, 03:51 PM

Your log is truncated just before the interesting part ...

daihard · 07-14-2006, 11:17 PM

Quote:

Originally Posted by jlliagre

Your log is truncated just before the interesting part ...

Actually, that _is_ the last line of the output produced by "-v".

spooon · 07-15-2006, 12:53 AM

is your Solaris machine set to allow X forwarding? check in /etc/ssh/sshd_config or similar and check for "X11Forwarding yes".

jlliagre · 07-15-2006, 03:07 AM

You can also increase the debug level with:
"ssh -X -v -v -v sparc-sf9"