This has me wondering why a developer was posting firewall rules on the E+ forum 3 weeks ago when the flood protection has been in the server code for almost 2 years? /me confused.
Then let me clear up your confusion.
Revision: 1762
Time: 03.01.2010 23:12
Author: tma
Path: code/server/sv_main.c (trunk)
Message: * Rate limit getstatus and rcon connectionless requests
...
What Grey Matter was referring to only applies to OpenArena (and its Mods). The E+ Dev you are referring to and players at ExcessivePlus.net are all Q3 users, they are using the official id 1.32c client not ioq3. I only re-posted his suggestion as it was relevant at the time.
E+ for OA has its own web site and separate Mod.