Dynamic zone update

[Ricardo D. Albano]

Hello, I'm trying to make a dynamic update of a record with the command
"nsupdate", the problem is that the server refuses the update for the zone
and the message log file says : "unapproved update from [127.0.0.1] for
dyn.com"

What's worng ?, I think that I missed up a command line in named.conf for
the zone dyn.com authorizing dynamic updates from x.x.x.x but I can't find
this commnad.

Any ideas ?
Tnx.

Ricardo D. Albano