Why do some of the network services fail at boot time but work once Red Hat Enterprise Linux system is up?

Solution Verified - Updated 2019-04-05T00:56:37+00:00 -

Issue

Some services that require network connectivity do not start properly during system boot, but they can be started manually once the system is up and running.
NIS service does not start at boot. Once the server is up and running, the NIS service can be started with out any issues. /var/log/messages shows the following error messages at boot time:
```
Jul 27 08:37:33 server1 ypbind: Host name lookup failure
Jul 27 08:38:27 server1 ypbind[8554]: broadcast: RPC: Timed out.
```

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