X connections refused between hosts (foo/unix:0 syntax)

[David Wright <D.Wright@open.ac.uk>]

I've obviously missed something in the explanations of .Xauthority files 
and MIT cookies. I have two Debian 1.3 machines, foo and bar with 
essentially identical configurations, with few changes from how things 
install themselves. I start X as user myself on foo. Typing xauth list
says foo/unix:0  MIT...1  a0b1... and so does xauth list :0 and xauth list 
unix:0 and xauth foo/unix:0 but not xauth foo:0 which says nothing.

If I su to root and copy ~myself/.Xauthority to ~root I can run xeyes with
xeyes -d :0 etc., but not xeyes -d foo:0 which is refused.

Now I telnet to bar and login as myself, ftp back to foo and copy 
.Xauthority to bar. On bar, xauth list and xauth list foo/unix:0 both say
foo/unix:0  MIT...1  a0b1... but the other forms say nothing.

Now I type xeyes -d :0 etc. and :0, unix:0 and foo/unix:0 are all 
obviously trying to display locally on bar, as the error is 111.
xeyes -d foo:0 is refused by the server on foo (an audit message appears 
on the VC which started X).

I presume I have to massage .Xauthority in some way, to create entries 
for :0, unix:0 and foo:0, but why does .Xauthority have foo/unix:0 put
into it by startx? I don't really understand what the syntax foo/unix 
means and can't find any documentation for it (though I've seen it in 
examples, e.g. page 82 of Mui and Pearce).
--
David Wright, Open University, Earth Science Department, Milton Keynes MK7 6AA
U.K.  email: d.wright@open.ac.uk  tel: +44 1908 653 739  fax: +44 1908 655 151


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