Crash server due to hacking

Hi,
If i only allow trusted people to my server no crash, but if i allow everyone my server crash every 15min - 1hour.
No memory peak, no cpu to 100%....
Only my client can connect to my server ( client checksum in hotuk)
If user want make server-to-server connect he got dc on connect( when her caractere reach ingame.
What can i do ?

Use QuantumFusions Ultimate Defense scripts.

QuantumFusions Ultimate Defense only "protect" from server-2-server connection
his program only check log if user isn't in ct table.

you cant see at log files wat the "no trusted" ppl make ?