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Message: <blockquote data-quote="chscag" data-source="post: 1603855" data-attributes="member: 46727"><p>The firewall built into modern routers will block certain incoming traffic only.  The software firewall provided by Apple will also block outgoing traffic.  Once you turn on the software firewall, it will notify you if an application or process is generating outgoing traffic and also notify you of incoming traffic.  In my opinion, there's no harm turning on the Apple software firewall. Just because Apple sets it to off on new installations does not mean it should always be off.  Apple leaves the firewall decision up to you the user.  And just for the record, I have in the past had both firewalls on and have never run into any problems or conflicts.</p></blockquote><p></p>