To allow a username can be used for remote login and tools like rcp, in the home directory of that user should add a file .rhosts and add the trusted host name or ip in that. To allow all host can use + char.
A point should be considered is that the permissions of the owner of this file should be set. (chmod [700, 600,500,400] .rhosts).
-rwx------ 1 user1 other 20 Apr 13 17:39 .rhosts
Another file that is used by system to remote access after checking of .rhosts is /etc/hosts.equiv. Each recored line in this file contain hostname [username], means which user from which machine can access without password to this machine. Same as previous file + char can be used to indicate all host or/and all users.
Attend to this point that user is local user that exist in /etc/passwd of
server machine.
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