usually its the perms for ~/.rhosts (chmod 600) or the reverse name look up on the host your going to for the host your coming over from ... make sure you can resolv the hostname to the ip address (and visa versa) using the "host" command from both systems ... if your doing DNS, you may want to add
hosts = local, bind4
into the /etc/netsvc.conf file so that hostnames are resolved locally before using any DNS servers.
ssh is great and secure, setting up ssh-keys also make it very usable, but sometimes you just dont need to go to those lengths for security if your hosts are all behind firewalls and accounts are secure etc... horses for courses my friend.
HTH
Mark Taylor
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