Blocked IP locations

I am dealing with a client of mine who can not login to his teamspeak server, but others can. To rule out the server as blocking his IP, I am wandering if there are any other places to look for blocked IP's or blacklists. I have BFD installed, on a linux unit with Cpanel/WHM.

I know about /etc/apf/deny_hosts.rules

Are there any other locations?

 

 

 

 

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