Hello,
In CentOS 7 it appears you cannot successfully disable IPv6 via sysctl; the INET6 AF is still leaking somehow and applications will attempt to use it. The correct way to disable IPv6 and avoid this issue with rpcbind is the following:
edit /etc/default/grub
add ipv6.disable=1 to GRUB_CMDLINE_LINUX
sudo /usr/sbin/grub2-mkconfig -o /boot/grub2/grub.cfg
reboot
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