NIS not sharing all maps

I have a NIS server and using a client to test it.
Binding to the server works fine, but getting maps constitutes a
problem.
'ypcat group' gives me the correct information, while 'ypcat passwd'
returns nothing.
Setting the NIS server in debug mode I get the following:

Found: nis_xxtmp/passwd.byname (0)
ypdb_close() called
connect from 10.0.0.2
ypdb_close_all() called
ypdb_close_all() called
ypdb_open("nis_xxtmp", "passwd.byname")
->Returning OK!
Opening: nis_xxtmp/passwd.byname (0) 80567d8
ypdb_close() called
-> Exit from ypproc_all without sending data.
sig_child: got signal 17
pid=12175
children = 0

I also tried running a client on the NIS server with the same result.
Access rights to the files for group and passwd are identical.

Any help is greatly appreciated!

Pingla