Could a VPN or firewall be interfering with the iPhone 6 restore and causing error 4013?

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Grade: Education Subject: Support
Could a VPN or firewall be interfering with the iPhone 6 restore and causing error 4013?
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Yes, it's possible. A VPN or firewall on your computer could be blocking the communication between iTunes/Finder and Apple's servers, or interfering with the restore process. Temporarily disable your VPN and firewall to see if that resolves the issue.