According to the Renderama manual, slaves are added via their IP addresses (eg 192.168.1.10).
Previous versions of Rama could usually resolve a domain name (eg cherry.mydomain.com) into
the IP address, but this was not a supported feature and was not tested when we rewrote the guts
of Rama for version 7.0.1 to get around the Leopard bugs.

Therefore, please make sure you are using the IP address of your slave and not the domain name.
Customers using domain names instead have reported that Rama master will crash when a slave is
not available on the network.