The server is up and accessable by the outside world. Since you are
coming from sunos, could you try regular ftp (not netscape) to get
the file.
ftp ftp.thunderstone.com
bin
cd /prod/webinator/sunos
get readme
get webinator.tar.Z
quit
Are you able to get to other ftp sites from your machine with ftp and/or
netscape? Do you have a firewall that blocks ftp?