Unable to connect to the MKS: Failed to connect to server

I receive this error trying to open a console session on a VM on host1 using the Vsphere Client from my computer.

I can do this fine on all the other hosts (which are all ESXi5)

From my computer I also cannot ping host1.

From my virtual center server I can both ping and open a console session just fine.

I am suspecting a firewall issue.  What would next steps be?

Thanks