SSL certificates have expiration dates. When your device’s internal clock is wrong—whether due to a dead CMOS battery, manual misconfiguration, or a wrong timezone—Netflix’s security system assumes your device is either too old or potentially malicious. The handshake fails instantly, triggering NW-6-403.
Unplug your and router from power for at least 30 seconds. netflix nw-6-403
If you have a VPN or proxy service active on your router or device, turn it off. Restore Default DNS: SSL certificates have expiration dates