Mod_protection is an apache module that integrate basic function of an IDS (intrusion detection system) and of a firewall (just an emulation for now). Your apache administrator have only to install mod_protection and define rules. A normal NIDS can't check SSL protected traffic, where mod_protection can. When a malicious client sends a request that matches on your rules the administrator will be warned and the client gets a user defined page or a error or warning.
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