Are you using DNS? If so, is the newly installed system registered in DNS? If you aren't using DNS, make the entry for the new system in the other systems' /etc/hosts files.
reason behind is your system is not able to resolve the ip against the host name u have given. if its not in DNS then all u need is a single line entry in /etc/hosts file as ip address and hostname. once the system is not in DNS then /etc/hosts is the file reff for ip resolution against hostname.