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Helpful answers
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Mar 10, 2016 1:33 AM in response to Jessica Lynneby Alberto Ravasio,I had similar problem with an old router and Internet Recovery. I can't remember if the faulty code was "-4403F".
Anyway I solved the issue configuring the router to set the IP address assigned to my Mac to a DMZ, so that is could talk to Apple's servers directly during Internet Recovery.
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Mar 10, 2016 9:48 AM in response to Jessica Lynneby Eric Root,Check System Preferences/Security & Privacy/Firewall to make sure it is turned off.