Openstack VM build fails with error
Solution 1:
I had exactly the same problem. After days and reading billions of Google search results, I found the solution:
Disabling IPv6
Edit /etc/sysctl.conf and load it with sysctl -p afterwards:
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
And no, I do not know why IPv6 made this fail...