Blocked IPs, finding the causes

I have APF with BFD and anti-dos. How do I find out the reasons for the IPs being blocked? For example, IPs blocked from brute force attack. There are so many, don't want any IPs to be blocked for opening too many http connections which I'm afraid many did when they use a download manager to download from the server. Thanks in advance.

 

 

 

 

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