ssh 1.2.27, X11, FreeBSD, Solaris

[Dave Mangot]

I'm having a problem with X11 forwarding between my FreeBSD 3.1
box and Solaris 2.6 & 7.

Both are running ssh 1.2.27.

When I make an ssh connection to a regular terminal prompt,
everything goes through just fine. When I try and
open up an X11 app (xclock for instance) my FreeBSD shell
hangs and the X11 app never appears.

I've run ssh with -v and sshd -d (debug) this is what I get.
(hostnames edited)
ssh -v:

myhost: Doing password authentication.
dave@fbsd1's password:
myhost: Requesting pty.
myhost: Requesting X11 forwarding with authentication spoofing.
myhost: Requesting shell.
myhost: Entering interactive session.
Last login: Wed Jul 28 13:37:19 1999 from ...blah blah shows ENV next

DISPLAY=fbsd1.domain.com:10.0

Running /usr/X11R6/bin/xauth add fbsd.mfi.com:10.0 MIT-MAGIC-COOKIE-1
bd53e6c95a0f2a755555555b3d40376f
Running /usr/X11R6/bin/xauth add 192.168.3.4:10.0 MIT-MAGIC-COOKIE-1
bd53e6c95a0f2a33339ab92b3d40376f
No mail.
% xterm

Then it just hangs.

sshd -d:

debug: RSA authentication for dave failed.
log: Password authentication for dave accepted.
debug: Allocating pty.
debug: Ignoring unsupported tty mode opcode 16 (0x10)
debug: Ignoring unsupported tty mode opcode 37 (0x25)
debug: Ignoring unsupported tty mode opcode 52 (0x34)
debug: Ignoring unsupported tty mode opcode 71 (0x47)
debug: Ignoring unsupported tty mode opcode 73 (0x49)
debug: Ignoring unsupported tty mode opcode 74 (0x4a)
debug: Ignoring unsupported tty mode opcode 75 (0x4b)
debug: Received request for X11 forwarding with auth spoofing.
debug: Allocated channel 0 of type 1.
debug: Forking shell.
debug: Entering interactive session.
debug: Setting controlling tty using TIOCSCTTY.
debug: X11 connection requested.
debug: Received SIGCHLD.
error: Strange, got SIGCHLD and wait returned pid 12573 but child is
12498

Then I'm dead in the water. Any ideas?

Compile flags for ssh were --with-x, --without-rsh, --with-libwrap,
--disable-asm

If I set the DISPLAY variable to myhost instead of the
bogus ssh display, I get the xclock no problem.

Any help would be greatly appreciated.

-Dave

[Bob Myers]

We're having the same problem on Solaris 2.5.1, ssh 1.2.26 and 1.2.27. It appears to be an issue with the TCP wrappers (libwrap) support. Interestingly, we did not have this problem with ssh 1.2.25.

TCP wrappers seems to generate an extra SIGCHILD that is misinterpreted by the server as a connection close when an X program is started.

--
Bob Myers InteleNet Communications, Inc.
Email: b...@InteleNet.net 18101 Von Karman Avenue, Suite 550
Phone: 949-851-8250 x227 Irvine, CA 92612
Fax: 949-851-1088 http://www.intelenet.net/

InteleNet Communications is a subsidiary of FirstWorld Communications, Inc.
http://www.firstworld.com/