compiling sshd on HP-UX 10.20 with configure --with-ipv4-default 
breaks X11-forwarding when sshd binary is run on HP-UX 10.20
(running the _same_ binary on 11.00 doesn't show the problem!).
OS or ssh-version on the client side doesn't matter.

here is the ssh -d output when trying to start xclock:

c3po koenig > xclock
debug1: Received X11 open request.
debug1: fd 4 setting TCP_NODELAY
debug1: fd 4 setting O_NONBLOCK
debug1: channel 0: new [X11 connection from 127.0.0.1 port 2686]
debug1: X11 connection uses different authentication protocol.
X11 connection rejected because of wrong authentication.
debug1: X11 rejected 0 i0/o0
debug1: channel 0: read failed
debug1: channel 0: close_read
debug1: channel 0: input open -> drain
debug1: channel 0: ibuf empty
debug1: channel 0: send ieof
debug1: channel 0: input drain -> wait_oclose
debug1: X11 closed 0 i2/o0
debug1: channel 0: rcvd oclose
debug1: channel 0: input wait_oclose -> closed
debug1: channel 0: rcvd ieof
debug1: channel 0: output open -> drain
debug1: channel 0: obuf empty
debug1: channel 0: close_write
debug1: channel 0: send oclose
debug1: channel 0: output drain -> closed
debug1: channel 0: is dead
debug1: channel 0: garbage collecting
debug1: channel_free: channel 0: X11 connection from 127.0.0.1 port 2686,
nchannels 1
X connection to localhost:13.0 broken (explicit kill or server shutdown).




if sshd is built with --with-ipv4-default  there are two obvious changes:

- $DISPLAY is set to localhost:10  instead of hostname:10

- only one xauth cookie is set for hostname/unix:10 (not localhost:10!), 
but there is no cookie in "xauth list" for tcp socket hostname:10 as in the
"working" case without --with-ipv4-default,.



Harald