Hi.. Had this issue for a while but finally have some time to look at resolving it. I Workstation Pro 15.5.2 installed but whenever I try to connect to an esxi 5.1 vm I get an MKS: Internal error and just a black screen. This just happens on Workstation Pro 15. It was fine on Workstation 12 and it also still connect fine using vsphere client console.
I’ve tried iincreasing Remote.maxconnections option also removing /re-adding the guest. Restarting the host but issue remains.. As this was working fine with Workstation 12 it looks particular to Workstation 15.. any ideas how I can get the display console working correctly instead of this MKS internal error and the black screen?