L2J Server

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L2J Revision Number:3271
L2JDP Revision Number:6369

Hello... We have a problem last days with login server. Every one or two minutes crashes and we get a potential floading from a certain ip which we have banned. After that we get an error message and login is down. This happens all day.I attach a picture to see the messages .any ideas how to avoid that?

Ban this address in firewall.

and if he change ip? anything else we can do?

Increase login server memory

i have already tried that. I set it from 124 to 1024 same results...