Hi
Couple of things to check
1. Is you client on the same subnet as the NIM server ?
2. Have a look at /etc/tftpaccess.ctl to ensure you have the following lines
allow:/tftpboot
3. Also check tftpd is running
[
pr-tsm] root # lssrc -s tftpd
Subsystem Group PID Status
tftpd tcpip 19356 active
4. Have a look at /etc/bootptab to ensure there are no incorrect or 'old' entries from previous attempts
Let me know your findings
HTH
Steve