Trying to connect to a remote server running 12.5.9 virtual machine and I get “Unable to connect to the MKS: vim.fault.GenericVmConfigFault” as the error message.  The list of running VMs appears, but it is not possible to connect to any of them.  It is the same issue that everyone else is having in this thread Re: Error “Unable to Connect to MKS” after upgrade to VMware Workstation 15.5.5

Not sure what changed for connections, but lots of unhappy people.