You have to run rcp.nisd -Y on the Solaris server,
this the (YP/NIS) compatibility mode.

On the AIX client you have make sure ypbind is running.

startsrc -s ypbind

I've look at the AIX 4.3 manual it never mentioned it supported
NIS+, it only supports NIS.

: hi,
: I have a sunOS 5.8 machine and NIS+ server running on
: it. Also I have a AIX 3.4 machine and I want to run it
: as NIS+ client. I made the AIX client but my NIS+ users
: can't login to AIX. niscat, nisdefaults and such commands
: run on AIX.
: How can I solve this authentication problem and how can
: my NIS+ users login to AIX?
: I get the following error message:
: You entered an invalid login name or password.
: Although I enter the correct name and password.
: thanks in advance.