The host computer on which you install Oracle VM Manager must have the host name correctly configured (pingable). Make sure the computer's host name matches the host name in the /etc/hosts file. Use the following command to check the host name:

# hostname

Use a text editor to check the host name in the /etc/hosts file. For example, to use VI enter

# vi /etc/hosts

For example, if the computer's host name is hostname1.example.com, and the IP address is, the corresponding item in the /etc/hosts file should be: hostname1.example.com hostname1

Oracle VM Manager requires that the system time reported by all Oracle VM Servers is synchronized with the time reported by the Oracle VM Manager host. Therefore, Oracle VM Manager runs an NTP daemon that is used to update the system time on each Oracle VM Server. The NTP daemon on Oracle VM Manager must be able to synchronize with other NTP servers, or it will fail to promote itself to a stratum that the Oracle VM Servers can use to synchronize with. If you do not run NTP within your own environment, the Oracle VM Manager host must be able to communicate with other NTP servers on the Internet using UDP 123. Any firewalls preventing this can cause unexpected behavior within Oracle VM Manager, including the inability to properly perform server discovery.

When a VLAN is used for the management network, IPv6 should be disabled before installing Oracle VM Manager. IPv6 is not supported by Oracle VM and disabling it before installing Oracle VM Manager may help to avoid some problems with network configuration in general.