Lockdown & no access to vCenter

Hi all,

after an update to vCenter Server, this is no longer responding. The two ESXi-Hosts are in Lockdown-Mode.

TSM, ssh and DCUI are disabled

Is there a way to restart the vCenter Server?
Perhaps per iLO or something else?

On the ESXi-Hosts are some other VMs, so to reboot the host and hope, HA works, is not so easy.

Thanks for ideas!

vSphere 5

2 ESXi 5 Update 1 on HP DL580 G7 (iLO accesible)

1 vCenter