Since the default tftp root directory is /tftpboot, the filename parameter in the dhcpd.conf file should be set to 'pxelinux.bin', instead of '/tftpboot/pxelinux.bin'.
Logged In: YES user_id=660960
Set the default bootfile to /pxelinux.bin
Logged In: YES
user_id=660960
Set the default bootfile to /pxelinux.bin