Hi.

Yes you can do ban on the "multiple 400 errors from same source IP"

Take this example

<active-response>
    <command>firewall-drop</command>
    <location>local</location>
    <rules_id>5720, 11210</rules_id> <!-- Multiple SSHD auth failures, 
proftpd -->
    <timeout>600</timeout>
</active-response>

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