A few things I have found in the past, which may or may not be related: 1) root.sh must never be run on box 2 until it has completely finished on box 1 2) networking must be 100% consistent: eg: eth0 always public, eth1 always private - if eth1 is public on one, and eth0 is public on other, blotto 3) public and all VIPs resolved consistently - listed on DNS or in ALL /etc/hosts 4) all userids must have no-password remote logins 5) SSH must NOT have a 'You are in breach if you login' message /Hans On 24/01/2013 10:19 AM, Lu Jiang wrote: > Thanks Dimitre. > I just checked these virtual boxes, looks the public interfaces are not > resolved by DNS, they are only resolved by the host file. Could this be the > problem? > >From Oracle's doc, looks public interface needs t be resolved by DNS and > >host file. > -- //www.freelists.org/webpage/oracle-l