On each machine, you need to add an entry to the /etc/hosts file, stating the IP address and hostname of the other machine.
For example, if you have one box with hostname machine1, which has IP 192.168.1.1; and a second box with hostname machine2 and IP 192.168.1.2; then you need to add:
192.168.1.2 machine2
to the /etc/hosts file on machine1, and add:
192.168.1.1 machine1
to the /etc/hosts file on machine1.
Enjoy!
-- Cerbere
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