Password selection ?

[netvirus]

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L2J Revision 4134:
L2JDP Revision 7354:

Has found out in itself in stdout.log a file here such records and them becomes more and more...

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Account missing for user 6161
Account missing for user 6161
Account missing for user moiiinsq
Account missing for user moiiinsq
Account missing for user moiiinsq
Account missing for user heromah
Account missing for user gfdtkgeljtd2
Account missing for user gfdtkgeljtd2
Account missing for user moiiinsq
Account missing for user moiiinsq
Account missing for user moiiinsq
Account missing for user unks
Account missing for user rklz
Account missing for user ������
Account missing for user driver
Account missing for user hotu
Account missing for user rhenjquth
Account missing for user rhenjquth
Account missing for user vjquthjq
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How to look with what IP addresses there are attempts of selection of the password ?
How to protect itself from such attacks ?
I have changed parametre in a file loginserver.properties

# How many times you can provide an invalid account/pass before the IP gets banned.
# Default: 10
LoginTryBeforeBan = 5 (Was 10)

[jurchiks]

imo those are not "hackers", but just dumb ppl who don't know you have auto-registration disabled.
what do you even mean by "selection of the password" if they're choosing the wrong USERNAME?

[ThePhoenixBird]

Account missing for user moiiinsq

Probably someone trying to bruteforce "moiiinsq" password or its just that the idiot forgot it.