Web Access is experimental support by VMware, therefore I always recommend to use vSphere Client in order to perform any task on VMs or ESX hosts
As I understand you need to restart a VM, so you have two options
1. Log via vSphere Client and do it from there, it appears that you are not able to (maybe is firewall between your workstation and your ESX / vCenter)
2. You can do it via command line on your SSH Session
Follow the KB1004340 https://kb.vmware.com/kb/1004340
Thanks for the reply...
You are correct, I can't login via the client (though i was using VI client and not vsphere) as for SSH I cannot use this method either as the instructions point to using commands such as vmware-cmd which fails with an unknown command error. So i guess at this point i am not logged onto the vmware console just the Ubuntu console that it runs on top of.
Any other thoughts?