We have set those nameservers but they have errors, so they will be
reverted back to ours.  Below is an output of a test on them :

Zone	inc-corporate.org.
Primary	ns1.dreamhost.com.	66.33.206.206
Secondary	ns2.dreamhost.com.	66.201.54.66
Secondary	ns3.dreamhost.com.	66.33.216.216
Progress
Progression		  Tests  	  Speed  	  Time  
18% 					25	1.72	1:10
 
TCP connectivity (IP=66.33.216.216)
Test results
---- fatal ----
f: Server doesn't listen/answer on port 53 for TCP protocol

    * Ref: IETF RFC1035 (p.32 4.2. Transport)

      The DNS assumes that messages will be transmitted as datagrams or
in a byte stream carried by a virtual circuit. While virtual circuits
can be used for any DNS activity, datagrams are preferred for queries
due to their lower overhead and better performance.

    * ns2.dreamhost.com./66.201.54.66
    * ns3.dreamhost.com./66.33.216.216
    * ns1.dreamhost.com./66.33.206.206


Final status
FAILURE