>>>>> "jt" == Jack Tanner <hotmail.com at ihok> writes:

  jt> I can ssh, I can start Emacs and ELI, and I can start Common Lisp in
  jt> Emacs. But when, from Emacs, I try to start Composer, I get "X11
  jt> connection rejected because of wrong authentication" in the terminal
  jt> and "Error: Attempt to use closed display #<xlib:display localhost:10
  jt> ( R0)>" in the Lisp listener in Emacs.

this is probably because the version of CLX that is distributed with
ACL doesn't handle the new types of entries in the ~/.Xauthority file
that are created by recent versions of X11 (esp for ssh-forwarded
connections).

The CLX distributed with CMUCL has been modified to support this. If
you don't want to upgrade to CMUCL *smirk*, I would ask Franz to fix
their CLX.
  
-- 
Eric Marsden                          <URL:http://www.laas.fr/~emarsden/>