can't start remote X programs

From: Tomasz Chmielewski (tch_at_nospam.unc.edu)
Date: 06/04/05 

Date: Sat, 04 Jun 2005 13:48:42 +0200

I have two computers running Linux and openssh-4.1p1.

They are connect to each other through an OpenVPN tunnel.

If I connect from BROKEN to GOOD using ssh -X ..., I can start remote X
programs without problems (for example, xclock).

When I connect from GOOD to BROKEN, I can't start remote X programs:

$ ssh -l user BROKEN -v -X
(...)

$ xclock
debug1: client_input_channel_open: ctype x11 rchan 3 win 65536 max 16384
debug1: client_request_x11: request from 127.0.0.1 1535
debug1: channel 1: new [x11]
debug1: confirm x11

And I can wait forever, but xclock is not started on my local machine.
I can't kill it with ctrl+C.

When I do "ps x" on BROKEN, it shows xclock is running.
When I kill it (killall xclock), I can't use the terminal on which I
started anymore.

Has anyone seen this before?

What should I look for?

I noticed that when I try to start "xclock" on BROKEN, there are some
packets going on lo interface (this is captured with iptraf):

localhost:1363 = 10 760 -PA- lo
localhost:6013 = 8 1016 --A- lo

Any ideas? 

-- 
Tomek

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