Can't start X based programs on a remote host

[Ralf.Doppelstein@epost.de (Ralf Doppelstein)]

Hi *,

I have 2 woody based hosts with gnome/gdm, last update at last night. I try to
open i.e. xclock on the remote host and show on the local host. I always get
the message
Can't open display: <local-host>:0.

I do the following steps:
A)
  localhost: xhost +
             ssh remotehost
  remotehost: export DISPLAY=...
              xclock
-> Error
B)
  localhost:  xauth extract - $DISPLAY | ssh remotehost xauth merge -
  remotehost: export DISPLAY=...
	      xclock
-> Error

In older debian distris version A) was working.
What is wrong? Has anyone an idea?
Thanks for help
Ralf


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