[ovirt-users] lose my server ovirt-engine in network

Hello, I installed my ovirt-engine during 1 month. I can connect with ssh or website. Yesterday, I rebooted my server ovirt-engine. But I can't connect it with ssh. My server lost in network. I can login with the machine, but I can't ping with network. Is there the problem with network setting ? Could you help me, please? Thanks, Anne Garcia