John Hughes wrote:
That's a bug in the documentation at 
http://openssi.org/cgi-bin/view?page=cvs.html

If you try the incantation from http://ci-linux.sourceforge.net/ it works:

cvs -d:pserver:anonymous@ci-linux.cvs.sourceforge.net:/cvsroot/ci-linux login

(Note: @ci-linux.cvs.sourceforge.net in place of @cvs.openssi.org).
  

(The problem is that cvs.openssi.org is an alias for ssic-linux.cvs.sourceforge.net, but the ci-linux stuff is a seperate sourceforge project, with its own cvs server).