Why PXE client is failing with "TFTP cannot open connection"?

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Issue

Why PXE client is failing with "TFTP cannot open connection"?
The client system can get its IP assigned from DHCP, but after that process it got ARP time.

PXE-E11: ARP timeout
PXE-E11: ARP timeout
PXE-E38: TFTP cannot open connection
PXE-MOF: Exiting Intel PXE ROM

Environment

Red Hat Enterprise Linux 6.6

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