If you’re addicted to use Oracle VM templates like myself and sometimes have networking problems there is one “must-do” task that will save you a lot of trouble: disabling the Linux firewall.
I experienced sshd, EM, scp, you-name-it-kind-of-networking-tool problems until I disabled the firewall inside each and every Oracle Virtual Machine (on a lab OVS server pool, not production).
And how to you acomplish that simple task?
1. log on as root
2. # service iptables stop
3. # chkconfig iptables off
If you want to save the config for later use, you can do this command before stoping the service:
# service iptables save
If you’re using IPv6 then the service is called “ip6tables” and the commands are the same.
Hope it helped.