NIS problem: not a valid domain

Dear all,

I'm trying to set up NIS and am running into a few problems.
I have "ypbind -d" on machineA and ypserv -d on "machineB". I keep
getting the error message from ypserv:

root@machineB:/usera# ypserv -d
[Welcome to the NYS YP Server, version 1.3.12 (with securenets)]
Find securenet: 255.0.0.0 127.0.0.0
Find securenet: 0.0.0.0 0.0.0.0
ypserv.conf: 0.0.0.0/0.0.0.0:shadow.byname:2:0:2
ypserv.conf: 0.0.0.0/0.0.0.0asswd.adjunct.byname:2:0:2
ypserv.conf: 0.0.0.0/0.0.0.0:*:0:0:2
ypproc_domain_nonack("machineA") [From: AAA.BBB.CC.DDD:32776]
connect from AAA.BBB.CC.DDD
-> Ignored (not a valid domain)

Any help welcome.

Thanks

CSG