During on-site support, you notice an iPhone connected to the office Wi-Fi SSID, but Safari cannot load any pages. In the Wi-Fi details screen, the address field shows 169.254.23.8 and no default gateway. Other phones browse normally on the same network. Which immediate action is most likely to restore internet connectivity for this phone?
Turn off cellular data for the device
Forget the network and reconnect with the same passphrase
An IPv4 address in the 169.254.x.x range indicates the phone assigned itself a link-local (APIPA) address because it did not receive a valid response from the DHCP server. Requesting a new DHCP lease forces the device to send another DHCP Discover/Request message and should supply a proper IP address, subnet mask, gateway, and DNS information. Forgetting the network could work but is a more disruptive step; toggling Bluetooth or disabling cellular data has no effect on Wi-Fi addressing.
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What is an APIPA address and why is it assigned?
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What happens when you tap 'Renew Lease' on an iPhone's Wi-Fi settings?
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Why is forgetting a network more disruptive than renewing a DHCP lease?