Blinded root !

[bind]

Despite the fact that our bind 8.2.5 runs very well we cant check root
servers :

[djr at romeo djr]$ nslookup .
Server:  romeo.invivo.net
Address:  194.250.225.205

Name:    




The name line is empty ! Switching to higher debug level is not helpful.
It does not seem to be an error from the logs.

Any idea ?

Thanks in advance