When using the tftp server, if you enable security and resrtict access to a large block of IPs, say a /22. The server will deny all Network and Broadcast addresses in that block. A piece of my log file is below. (Addresses have been changed)
2012-12-19 14:51:37,043  INFO TFTPServer.Service.PacketParser.RequestPacket - Received request packet, file name: file_cfg.cfg, transfer mode: binary, block size: , tsize: , timeout:
2012-12-19 14:51:37,043  INFO TFTPServer.Service.TFTPServer - Checking permission for IP 10.0.1.255 opCode: 1
2012-12-19 14:51:37,043  INFO TFTPServer.Service.TFTPServer - 10.0.1.255 fits within 10.0.1.1 and 10.0.7.254: False (this should be TRUE)
2012-12-19 14:51:37,043  INFO TFTPServer.Service.TFTPServer - returning SuchIpIsProhibited
2012-12-19 14:51:37,043  INFO TFTPServer.Service.ConnectionPool - Declined request from 10.0.1.255:20000
We're currently running version 10.9.0.24
I see that 10.9.0.25 is out. Does this fix the problem?
This is an issue in TFTP server. This is not fixed in 10.9.0.25.
This will be fixed in one of the next versions of TFTP