Samsung Wi-Fi Not Connecting — Causes & Fixes (2026)
Galaxy stuck on Obtaining IP address, connected with no internet, or dropping Wi-Fi constantly — a working diagnostic order.
Problem overview
Wi-Fi problems on a Galaxy are almost always one of four things: the router, the saved network profile on the phone, a network setting the phone changed on its own, or a genuine radio fault. The order matters, because a genuine hardware fault is the rarest of the four and the easiest to test for last.
The error message tells you a lot. Connected, no internet means the phone joined the network fine but cannot reach the wider internet — that is a router, DNS or captive-portal problem, not a phone fault. Obtaining IP address that never completes points at DHCP on the router, or at a MAC-filter or randomised-MAC mismatch. Authentication error or Incorrect password with a password you know is right usually means a stale saved profile or a router that has changed security mode. Constant dropping usually comes from band-steering between 2.4GHz and 5GHz, or from power-saving putting the radio to sleep.
Randomised MAC addresses catch a lot of people out. One UI generates a different MAC per network by default, so a router with MAC filtering, or a school, office or hotel that registered your old address, will refuse the connection. Switching that single setting to the phone MAC fixes many stubborn cases. Test other devices on the same network before anything else — if they all struggle, the router is your target.
Possible causes
Router or ISP fault
If every device on the network is affected, the phone is innocent. A router reboot and an ISP status check come first.
A stale saved network profile
Corrupted saved credentials cause authentication errors with a correct password. Forgetting the network and rejoining rebuilds the profile.
Randomised MAC address
One UI uses a random MAC per network by default. Routers with MAC filtering, and managed networks that whitelisted your old address, reject the connection.
Band steering and weak 5GHz signal
A single network name covering both bands makes the phone hop between them. At the edge of 5GHz range this causes repeated drops.
Adaptive Wi-Fi and power saving
Adaptive Wi-Fi switches to mobile data on a weak signal, and battery saver can idle the radio, which looks like the Wi-Fi dropping by itself.
Captive portal not loading
Hotel, café and campus networks need a sign-in page. If it never appears you get Connected, no internet even though everything is technically working.
DNS or private DNS misconfiguration
A private DNS host set in Connections > More connection settings will break browsing on networks that block it, while the Wi-Fi icon still shows connected.
Quick checks
- Do other devices work on the same Wi-Fi? If not, restart the router first.
- Toggle Airplane mode on for 10 seconds, then off.
- Forget the network (Settings > Connections > Wi-Fi > gear icon > Forget) and rejoin.
- Move within a few metres of the router to rule out range and 5GHz drop-off.
- Check Settings > Connections > More connection settings > Private DNS is set to Off or Automatic.
- Try a mobile hotspot from another phone — if that connects fine, the fault is the router or its settings.
Diagnostic tests
Network & Signal
Inspect signal strength, cell ID and neighbouring towers.
Relevant Samsung codes
Wi-Fi MAC Address
Displays the Wi-Fi MAC address of the device.
Hardware Test Menu
Samsung's built-in test menu for display, speakers, sensors, camera and vibration.
Service Mode / Network Status
Displays network state, cell tower info and signal details.
Step-by-step solutions
1. Restart both ends
Power-cycle the router (30 seconds off) and restart the phone. This alone clears a large share of DHCP and lease problems, and it costs nothing.
2. Forget and rejoin the network
Settings > Connections > Wi-Fi, tap the gear beside the network, choose Forget, then reconnect and type the password carefully. This rebuilds a profile that may have been corrupted by a router firmware or security-mode change.
3. Turn off randomised MAC for that network
Settings > Connections > Wi-Fi > gear icon beside the network > View more > MAC address type, and choose Phone MAC. Do this before contacting an IT desk — on filtered and managed networks it is very often the entire problem.
4. Split the bands or lock to 2.4GHz
If the phone drops constantly at range, give the 2.4GHz and 5GHz networks separate names in the router settings and join the 2.4GHz one. It is slower but far more stable through walls.
5. Turn off Adaptive Wi-Fi and Smart switching
Settings > Connections > Wi-Fi > three-dot menu > Intelligent Wi-Fi, and turn off Switch to mobile data and Adaptive Wi-Fi. These features are helpful normally, but they mask what is actually happening while you are diagnosing.
6. Check DNS and captive portals
Set Settings > Connections > More connection settings > Private DNS to Off. On a public network, open a plain http:// site (not https) to force the sign-in page, or visit the router's portal address directly.
7. Reset network settings
Settings > General management > Reset > Reset network settings. This clears every saved Wi-Fi network, Bluetooth pairing and mobile-data setting — you will need your Wi-Fi passwords again — and it resolves most persistent connection faults that survive the steps above.
8. Test the radio itself
Dial the Wi-Fi service code below to open the Wi-Fi test screen (available on many Galaxy models) or use Samsung Members > Diagnostics > Wi-Fi. If the radio cannot scan or shows no MAC address, the hardware needs attention. Otherwise the fault is the network.
When to seek repair
Seek repair if the phone cannot scan for any network, if the Wi-Fi toggle turns itself off, or if Wi-Fi fails after a network-settings reset and a factory reset while other devices work fine on the same router. Those point at the radio or antenna.
Related guides
Frequently asked questions
- Why does my Samsung say Connected, no internet?
- The phone joined the access point but cannot reach the internet through it. Causes are a router or ISP outage, an unfinished captive-portal sign-in, or a private DNS setting. Test the same network on another device to narrow it down.
- What does Obtaining IP address forever mean?
- DHCP on the router is not issuing an address. Restart the router, forget and rejoin the network, and switch the MAC address type to Phone MAC in case a filter is blocking the randomised address.
- Why does my Galaxy keep dropping Wi-Fi?
- Usually band steering at the edge of 5GHz coverage, or Adaptive Wi-Fi switching to mobile data. Separate the 2.4GHz and 5GHz network names, join 2.4GHz, and turn off Intelligent Wi-Fi while testing.
- Should I turn off randomised MAC address?
- Only on networks you trust, such as home or work. Randomised MAC is a privacy feature and is worth keeping on public networks, but it breaks MAC-filtered and registration-based networks.
- Will resetting network settings delete my data?
- No. It removes saved Wi-Fi networks and passwords, Bluetooth pairings and mobile-data preferences only. Photos, apps and accounts are untouched.
- Is Wi-Fi calling related to these problems?
- Indirectly. If Wi-Fi is unstable, Wi-Fi calling will drop calls too. Fix the Wi-Fi connection first, then re-test calling — do not disable Wi-Fi calling as a workaround before you know the cause.