OpenSSH_3.6.1p2, HP-UX 11.00 X11 Forwarding

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I somehow cannot get the ssh X11 forwarding enabled with
OpenSSH_3.6.1p2 on HP-UX 11.00 the way it worked on HP-UX 10.20.
wmidi midi:~ 1 > ssh -V
OpenSSH_3.6.1p2, SSH protocols 1.5/2.0, OpenSSL 0x0090609f

This means after
the answer to
  hp-machine> xterm

debug1: client_input_channel_open: ctype x11 rchan 2 win 65536 max 16384
debug1: client_request_x11: request from 53976
debug1: fd 9 setting O_NONBLOCK
debug1: fd 9 IS O_NONBLOCK
debug1: channel 1: new [x11]
debug1: confirm x11
debug1: X11 connection uses different authentication protocol.
debug1: X11 rejected 1 i1/o16
debug1: channel 1: read failed
debug1: channel 1: input open->drain
debug1: channel 1: close_read
debug1: channel 1: input: no drain shortcut
debug1: channel 1: ibuf empty
debug1: channel 1: input drain->closed
debug1: channel 1: send eof
debug1: channel 1: write failed
debug1: channel 1: output open->closed
debug1: channel 1: close_write
debug1: X11 closed 1 i8/o128
debug1: channel 1: send close
debug1: channel 1: rcvd close
debug1: channel 1: full closed2
debug1: channel_free: channel 1: status: The following connections are open:
  #0 client-session (t4 r0 i1/0 o16/0 fd 6/7)
  #1 x11 (t7 r2 i8/0 o128/0 fd 9/9)

X connection to localhost:10.0 broken (explicit kill or server shutdown).

though (of course) the server is still running on the hp-machine:

    root 24267     1  0 22:09:34 ?         0:01 /usr/local/sbin/sshd
    midi 25480 25468  0 22:25:37 ?         0:00 sshd: midi@pts/0
    root 25468 24267  0 22:25:30 ?         0:00 sshd: midi [priv]

One can for example use xclock (and it opens) on the hp-machine
and one can also omit the "-X" when login in and then set
manually DISPLAY (under a bash) and the xterm will pop-up.

The configuration is

# Host *
#   ForwardAgent no
ForwardAgent yes
ForwardX11 yes
#   ForwardX11 no
 in ssh_config and

#X11Forwarding no
X11Forwarding yes
X11DisplayOffset 10
#X11UseLocalhost yes

in sshd_config and changing/incorporating X11UseLocalhost does not help.
So the overall question is whether the explicit setting of the
DISPLAY on the remote HP-UX 11.00 can be avoided by getting the "-X"

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