Hi
i have a similar issue on my site.
My iptables is down and i see that the packets from the switch are entry in the tftp server:
[root@machine tftpboot]# tcpdump -n -i eth0 -vvv port tftp
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
10:34:11.588373 IP (tos 0x0, ttl 254, id 37752, offset 0, flags [none], proto: UDP (17), length: 63) 192.168.30.1.fcip-port > 192.168.30.10.tftp: [udp sum ok] 35 WRQ "swismal4210.cfg" octet tsize 9629
but, after 10 packets like this the file is crated with 0 bytes.
On the switch side i see a 90 sec timeout after a "Can't connect to the server" messagge
It works well with other switches in the same network of the server, so the problem seems to be something related with NAT, firewall(acting as a router between the two nets) and tftp protocol.
I saw some documents to config the tftp service in the firewall, but unfortunatley i'm not the admin of the firewall.
I dont know if this is your case.
pd. i don't trust myself about it, but i remember that this works the first time i programmed the script.
Regards
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