On 12/08/16 17:33, Andrew Dent wrote: > So after reading this, felt I should apply the fix to a CentOS6 VPS that > I have. > http://www.zdnet.com/article/linux-tcp-flaw-lets-anyone-hijack-internet-traffic/ > > [root at vps ~]# uname -r > 2.6.32-042stab108.7 That's not a CentOS kernel, it's an openvz kernel that is not provided by CentOS. The fixes and workarounds shown on the internet will not work with that kernel. I suggest you find a better VPS provider, what you have is essentially a glorified chroot, not a real VPS and there are many aspects of CentOS that are simply broken in that model. Peter