5 14:54:37 LTSPsvc01 ldminfod[2876]: connect from 192.168.0.21 (192.168.0.21)
Mar 5 14:54:40 LTSPsvc01 nbd_server[1143]: connect from 192.168.0.21, assigned file is /opt/ltsp/images/i386.img
Mar 5 14:54:40 LTSPsvc01 nbd_server[1143]: Can't open authorization file (null) (Bad address).
Mar 5 14:54:40 LTSPsvc01 nbd_server[1143]: Authorized client
Mar 5 14:54:40 LTSPsvc01 nbd_server[2879]: Starting to serve
Mar 5 14:54:40 LTSPsvc01 nbd_server[2879]: Size of exported file/device is 558465024
Mar 5 14:54:40 LTSPsvc01 nbd_server[2879]: Disconnect request received.
Mar 5 14:54:40 LTSPsvc01 nbd_server[1143]: Child exited with 0
Mar 5 14:55:22 LTSPsvc01 ldminfod[3127]: connect from 192.168.0.21 (192.168.0.21)
Mar 5 14:55:23 LTSPsvc01 nbd_server[1143]: connect from 192.168.0.21, assigned file is /opt/ltsp/images/i386.img
Mar 5 14:55:23 LTSPsvc01 nbd_server[1143]: Can't open authorization file (null) (Bad address).
Mar 5 14:55:23 LTSPsvc01 nbd_server[1143]: Authorized client
Mar 5 14:55:23 LTSPsvc01 nbd_server[3130]: Starting to serve
Mar 5 14:55:23 LTSPsvc01 nbd_server[3130]: Size of exported file/device is 558465024
Mar 5 14:55:23 LTSPsvc01 nbd_server[3130]: Disconnect request received.
Mar 5 14:55:23 LTSPsvc01 nbd_server[1143]: Child exited with 0

have look on line for answer but can't find one 
have updated ssh keys and up date images
and restarted TFTP and NBD and shut down client and server and restarted them  this is new install for learning LTSP
have fixed i386.tmp problem and GPXE reports DHCP OK

Help

walt