Glad to see I'm not the only one. Currently we're also experiencing these daily attacks. It's highly annoying. Our COD2 servers have been running perfect for the past 1.5 year, but since last week, they are constantly under attack.
First I thought it was an issue with our mod being too large, even though I didn't change anything and it ran fine for the past 12+ months. So I shaved off 20KB, reducing it's filesize from 145KB to 125KB, but that didn't help. Even reducing the server slots to just 8 slots doesn't fix it.

Sadly we're also using Windows and switching to Linux/libcod is not an option sadly. We're running COD2 1.0; If someone could/wants to patch the executable that prevents this attack I would be very grateful. I'll put up a bounty of 10 euros for anyone who can fix this

Code:
2: EXE_TIMEDOUT
clientDownload: 10 : begining "main/JUST_1_FILE_PLEASE_WAIT.iwd"
********************
ERROR: Netchan_Transmit: length = 18487
********************
----- Server Shutdown -----
Sending heartbeat to cod2master.activision.com
==== ShutdownGame ====
0: EXE_DISCONNECTED
1: EXE_DISCONNECTED
3: EXE_DISCONNECTED
4: EXE_DISCONNECTED
5: EXE_DISCONNECTED
6: EXE_DISCONNECTED
7: EXE_DISCONNECTED
8: EXE_DISCONNECTED
9: EXE_DISCONNECTED
10: EXE_DISCONNECTED
---------------------------
Hitch warning: 501 msec frame time