Preventing unknown sites from logging in
The script remote.unknown is executed when a site whose name
does not appear in your Systems file dials into your system.
It logs the conversation attempt and fails to make a connection.
If you wish to allow such ``unknown'' systems to log in to your
system, you can change the permissions of this file so it cannot execute
and your system accepts any communication requests. To do so, enter
the following commands while logged in as root:
chmod 000 remote.unknown