NIS master gives "RPC: Unknown host" errors

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Issue

When updating any NIS file on NIS master server results in following error:

[root@host yp]# make netgroup
Updating netgroup...
host-1 : RPC: Unknown host
host-0 : RPC: Unknown host
host-2 : RPC: Unknown host
host-3 : RPC: Unknown host
host-4 : RPC: Unknown host

Environment

Red Hat Enterprise Linux 5.7

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