Non-root NIS client users cannot resolve username and groupname - Red Hat Customer Portal

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Issue

Non-root NIS client users cannot resolve usernames and groupnames. NIS server shows the following errors in /var/log/messages at the time:

Dec 14 18:59:49 hostname ypserv[9935]: refused connect from 192.168.0.88:55748 to procedure ypproc_match (domain.example.com,passwd.byuid;-1)
Dec 14 18:59:49 hostname ypserv[9935]: refused connect from 192.168.0.88:41960 to procedure ypproc_match (domain.example.com,passwd.byuid;-1)

When lookups are performed by the root user, they work fine.

Environment

Red Hat Enterprise Linux
NIS server and NIS client

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