All machines here have spectre and meltdown exploits mitigated except for CentOS6. Redhat has kicked out a new kernel that addresses the exploit on i7-6700k hardware but does not address it on i7-6850k hardware which is officially not supported by Redhat 6.
Consequently I am in the process of moving this host to an i7-6700k based server. This will take about 1/2 hour during which CentOS6 will be inaccessible. Please use a different shell server during this time. All x2go supported windowing environments are supported on MxLinux and Ubuntu.