BFD warning, what to do now?

hi, im recieving this in my email

The remote system 222.78.128.90 was found to have exceeded acceptable login
failures on sv2.mydomain.net. As such the attacking host has been banned
from further accessing this system; for the integrity of your host you should
investigate this event as soon as possible.
my i know how to investigate further this type of attacks?

thanks.

 

 

 

 

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