Nameservers and ERROR: 901 Unexpected RCODE

Digidestination

Registered
Nov 20, 2012
2
0
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cPanel Access Level
Root Administrator
I have got a new Linux based server and have finalized installation of my WHM on it.

When I was asked to select Name servers I have selected following:

digi1.1upo.com The nameserver has been assigned the IP 91.109.13.229 and A record ip: 91.109.13.228
digi2.1upo.com The nameserver has been assigned the IP 91.109.13.228 and A record ip: 91.109.13.228

The same name servers I have registered as nameservers through my domain registrar.

All seems to be working fine and several accounts are already active, and I can see that name servers are doing their job :)

However when I'm trying to add those new nameservers to neverhill.de on 1und1.de domain name regisrar
I'm geting following error:

1021: regapi.error_illegal: Code/Msg=[1021/Nameserver error]; #1 args=[ERROR: 901 Unexpected RCODE (target, entity, RCODE) (127.0.0.2/127.0.0.2:53, digi2.1upo.com, NXDOMAIN)]
I'm not sure what above message means, what did I do wrong and how it can be fixed.