ypserv refused connect

Dear managers,

I am getting lots of the following error messge on a slave nis Linux
server lately, the only thing that was changed was the implementing of
the passwd.adjunct.byname on the NIS master (solaris 9)

ypserv[11225]: refused connect from 10.8.208.85:34346 to procedure
ypproc_match (nis_domain,passwd.adjunct.byname;-1)

there is nscd daemon runing as root, with passwd caching disabled,
restarting the services such as ypservr, portmap did not reslove the
issue, checking the sevice using rpcinfo -u nisslave servicename does
not report any obvious problems from any clients involved.

how would one go about troubleshooting such an issue, and resolving
it, the main subsystme involved i guess are the portmapper, ypserv,
and nscd on the server side, and ypbind, and portmapper, and nscd on
the client side, the clients, and servers are all redhat linux 8.0

regards

Walid.
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