I am seeing essentially the same thing. Final installation fails with this error. I can resolve the name wthout problem. I can't try to ping because we don't allow ICMP echo to the internet. Can't fetch with wget. Can't hit the URL with a browser. Can someone help please? What I thought was going to be a quick a dirty proof of concept before convincing my bosses Zimbra is the way to go, is rapidly turning into a failure.
