I've a test enviromet with 2 x ESX 4 Server and a vCenter Server. I connect with the vClient to the vCenter Server over a VPN tunnel. When I start the console of a VM, I become the error message "Unable to connect to the MKS: ..... :903.
From the PC with the vClient I can connect over telnet to Port 902, Port 903 doesn't work.
From the vCenter Server I can connect over telnet to Port 902 and 903.
All traffic on VPN will forward. What can I do do correct the problem? Hope you have some ideas.
I suspect windows firewall is blocking 903 at VIclient side
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What about vCenter server firewall ? are you able to telenet to port 903 on vCenter from other PCs in network ?