Step 1. Check IPv6 module is enable for Kernel lsmod | grep ipv6 step 2.Enable IT. 2.1 ##notice may file name is different## Editing the file /etc/modprobe.d/disable_ipv6.conf Change options ipv6 disable=0 to options ipv6 disable=1 2.2 Editing the file /etc/sysconfig/network Change NETWORKING_IPV6=no to NETWORKING_IPV6=yes step 3 rebooting your server step 4 configure kernel parameters to enable IPv6 sysctl -w net.ipv6.conf.all.disable_ipv6=0 then reboot step 5 Checking if it works. sysctl -a | grep ipv6 then it will outputting something like net.ipv6.confXXXXXXX = 0. all done.