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Blocking IP’s from your servers

To block and IP only for a site:

To block an IP server-wide:

You can use Config Server & Firewall to conveniently ban an IP server-wide.

Go to Site settings > General TAB > Site Tools > CSF.
Scroll down to [QUICK DENY] and type in the IP and reason for blocking (to remember later why it was blocked).
Then click [QUICK DENY]