Unable to add second nic to vSwitch HP BL460c

Hi,

I have a HP BL460c with a clean install of ESXi 5, I have tried both the VMware image and the HP image and I am having the same problem. When the server is install a default vSwitch is created and a nic is added. I am able to connect to the host fine. Now, when I try to add a second nic I lose connection to the host and have to remove the second nic from the command line. The error I get is below. I have tried adding a nic from the command line  as well.

Call "HostNetworkSystem.UpdateVirtualSwitch" for object "networkSystem" on ESXi

Thanks,