Backup/Restore VM Manager (3.2.3) with new machine

Dear All Experts,
I try to backup from old manager configuration file to new manager machine as below:

$exp ovs/Heng123456 grants=y compress=y file=/tmp/ovsbackup.dmp

Then I try to restore this backup file on new manager as below:

>drop user ovs cascade;
>create user ovs identified by Heng123456;
>grant connect, resource to ovs;
>exit

$imp ovs/Heng123456 file=/tmp/ovsbackup.dmp full=y
# service ovmm start

I try  and cannot access to manager from browser.

Please kindly give advice or share your experience.

Thanks and regards,
Heng