bad horizontal referral

[mauromarzorati]

Hello, I'm trying to have a separate zone for a subdomain of my primary domain. I'm having trouble creating this zone (new domain) with the Free DNS GUI, which complains that the zone does not pass verification requiring delegation to ns[1-5].he.net be done first. I have done this, and yet the validation still fails with the new name. To verify that the NS records are active, I run `dig +trace` and receive bad (horizontal) referral message from ns[1-5].he.net. So I'm unclear how to overcome this blocker when creating the additional zone. The zone in question is `test.marzorati.us`