I also encountered this error while registering a domain. The workaround is:- 1. Register the domain with domain forwarding. 2. Once it is set up go to 'My Domains' and then edit the domain. 3. Then set the nameservers to ns1.heliohost.org and ns2.heliohost.org 4. Then it works. This error just comes while registering a new domain.(and not when editing the domain settings) Same problem existed here:(I got it to work by the workaround)(http://www.helionet.org/index/topic/19109-need-help-with-setting-the-dns/)