If other devices work, the modem and provider are probably healthy. Check the failing device’s IP address, VPN, private DNS, captive portal and saved network profile. Turn off the VPN or relay for a test and reload a page. Check the IP address and DNS, and forget and rejoin the network.
Differential
Likely causes of “Only one device connects to Wi-Fi but has no internet”, and how to tell them apart
- 1
A VPN or private relay is blocking traffic
What separates it The device shows connected but nothing loads, and a VPN or privacy relay is on.
How to confirm Turn off the VPN or relay for a test and reload a page.
- 2
The device has a bad IP, DNS or saved network profile
What separates it Other devices work, and this device shows an odd IP address or an old DNS server.
How to confirm Check the IP address and DNS, and forget and rejoin the network.
- 3
A captive portal or sign-in page is waiting
What separates it The device is on a public-style network that needs a sign-in, and no page has loaded.
How to confirm Open a plain http page to trigger the sign-in page.
- 4
Wrong date and time or a blocking app on the device
What separates it Secure pages fail with certificate errors and the device clock is wrong.
How to confirm Check the date and time settings and any security or filter apps.
Before you touch a setting
Record this first — changing settings destroys the evidence
- Whether the device works on another Wi-Fi network or a mobile connection.
- The device's IP address, DNS and whether a VPN or filter is on.
- The exact error shown in the browser or app.
Try in this order
0 of 4 completedCapture the exact symptom
ReversibleCompare the device on another Wi-Fi network and note its assigned IP, date/time and VPN status.
Run the smallest isolation test
ReversibleForget and rejoin only the affected network, disable VPN/private relay for a test and renew automatic IP/DNS.
Correct only the proven cause
ReversibleCorrect the app/profile blocking traffic or update the device; reserve network-wide resets for all-device failures.
Verify before changing anything else
ReversibleLoad two sites and one app after sleep/wake on the repaired connection.
Stop boundary
When this stops being a self-service repair
- !Save network-wide resets for the case where every device is affected, not just one.
Evidence ledger
Sources behind this answer
Exact questions
Common questions
Why is only my laptop unable to get online?+
When other devices work, the router and provider are fine. Check the laptop's VPN, DNS, saved network profile and clock before touching the router.
Why does only one device connect?+
Router settings such as MAC filtering or IP conflicts can limit devices.
Is DHCP full?+
A full address pool can block new devices.