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?