This issue has nothing to do with the DNS. I have tried to deploy 6.7U1 from different hosts on different hosts. It is not working at all. There is no difference using the IP or the FQDN, no difference. You can enter the data, it fails. Try again - it goes to 20% and fails. Try again with the same data, fails again. It is totally random. I did try this on fresh installed hosts, fresh laptop, VM to perform the installation on. Nothing to do with any firewall either. DNS is fine. All entries are properly set and resolve fine.

Regards,

Robert