What should I do if my firewall is preventing the HP Envy 4500 from being found on the network?
Security software such as firewalls can block communication between your computer and the printer when installing over a network. If your printer cannot be found, temporarily disable your firewall and check if the problem goes away. For more help, visit www.hp.com/go/wpc-firewall. (Page 4)
From the official HP Envy 4500 E All-in-One Printer manual, page 4
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