PowerChute for ESXi on vMA doesn't shuts ESXi down

[Anonymous user]

Hi!

We have purchased a SUA-2200 UPS with a Network Management Card to support our single ESXi 4 server. We have a problem with the PowerChute when we installed it on the vMA (Vmware management assistant) of our ESXi. The PowerChute on the vMA receives shutdown signal from the NMC and it shuts down the vMA ONLY the PowerChute could not shuts the ESXi down so the guest virtual machines could not get the graceful shutdown signal from the ESXi.
We went through the documentation and done the following:

1. Installed the PowerChute to the vMA correctly
2. Initiated VIFP so the vMA can run commands without authentication requirement
3. Opened the required ports for the communication with iptable on the vMA
4. Configured the PowerChute and make sure that the communication between the vMA and the NMC is correct
5. Set the "Virtual Machine Startup/Shutdown" in the vSphere to allow the VM shutdown for the ESXi when shutdown occurs

As I said the PowerChute can receive the information from NMC and shuts down the vMA only. But when the vMA shuted down the ESXi still leaves Powered on.

Have you experienced any problem like this with the vMA and the Powerchute? Or do you know what might be the problem in this case?

Thank you for the answers!

Robert