Full signal strength, connected, and nothing loads. This particular failure is confusing because every visible indicator says things are fine. What the bars actually show is the link between your device and the router, and that link can be perfect while everything beyond it is broken.
The short answer
Work outward from your device. Check whether other devices are also affected, because that tells you immediately whether the fault is one device or the whole network. Then restart the router, then check DNS, then look at the modem lights. Most cases are a DNS problem or a router that needs restarting, and both are two-minute fixes.
The one test that halves the problem
Before anything else: can another device reach the internet? A phone on the same Wi-Fi, a laptop, anything.
- Only one device affected. The fault is on that device. Skip to the device fixes below.
- Every device affected. The fault is the router, the modem or the line. Skip to the network fixes.
That single test saves you from spending twenty minutes resetting a laptop when the problem is outside your house.
If one device is affected
Toggle Wi-Fi off and on
Obvious, and it works often enough to be worth the ten seconds. It forces the device to request a fresh address from the router.
Forget the network and rejoin
This clears a stale or corrupted network profile, including a wrong stored address or gateway. You will need the Wi-Fi password to rejoin, so have it to hand.
Check for an IP address conflict
If two devices have been assigned the same address, both behave exactly like this. Restarting the device usually resolves it, and reserving a fixed address in the router prevents it recurring.
Change the DNS server
DNS turns website names into addresses, and when it fails you get a connection that works but loads nothing. In the device network settings, set DNS manually to a well-known public resolver and try again. If pages load immediately, your provider’s DNS was the problem.
Turn off any VPN or proxy
A VPN that has disconnected badly can leave the device routing traffic into nothing. Disable it fully, and check for a proxy setting that a previous VPN left behind.
Check the date and time
A clock that is wrong by more than a few minutes breaks the security certificates that most sites use, and the symptom is pages that refuse to load with certificate errors. Set date and time to automatic.
Reset network settings
On a phone this clears Wi-Fi, Bluetooth and mobile settings together. On a computer, there is a network reset option that reinstalls the adapters. You will need to re-enter Wi-Fi passwords afterwards.
Check for a captive portal
On public or guest networks, you are connected but confined until you accept terms on a sign-in page. Try opening any plain, non-secure web page to force that page to appear.
If every device is affected
Read the modem lights
The internet or online light is the one that matters. Solid usually means a working connection to your provider. Blinking or off means the line is down, and nothing you do to the router will help. Note the pattern before you restart anything, because restarting erases the evidence.
Restart the modem and router in order
Unplug both. Wait a full minute. Plug the modem in first and wait for its lights to settle, which can take two or three minutes. Then plug in the router. Order matters, because the router needs a working connection to negotiate against.
Connect a computer directly to the modem
If you have separate modem and router, bypass the router with an ethernet cable. If the internet works, the router is at fault. If it does not, the problem is the line or the modem.
Check for an outage
Look at your provider’s status page or social media on mobile data. A surprising share of these are outages, and checking takes thirty seconds before you spend an hour troubleshooting your own equipment.
Check the router is not in the wrong mode
A router accidentally switched into bridge or access point mode will hand out connections that go nowhere. If anyone has been in the settings recently, verify this.
Look at the router system log
Most routers keep a log, and it usually names the problem directly: authentication failures, lost synchronisation, or DHCP errors. It is the most underused diagnostic in the house.
Check the cables at both ends
The cable from the wall to the modem, and from modem to router. Unplug and firmly reseat each. A cable that has been nudged by a vacuum cleaner is a genuinely common cause.
Factory reset the router as a last resort
This wipes your Wi-Fi name, password and every setting. Do it only after the steps above, and only if you know how to set the router up again, including any provider-specific configuration.
If changing DNS fixes it, consider setting the same DNS server in the router rather than on each device. Every device then benefits, including the ones you cannot easily configure like smart speakers and TVs.
Why DNS causes this so often
Every website visit starts with a lookup that converts a name into a numeric address. That lookup goes to a DNS server, usually your provider’s by default. When that server is slow, overloaded or misconfigured, your device has a perfectly good connection and simply cannot find out where anything lives.
The giveaway is that a site will sometimes load if you type its numeric address directly, while the name does not work. Most people never test that, which is why DNS problems get mistaken for broken connections.
Before factory resetting a provider-supplied router, find out whether it needs specific settings to connect. Some require a username and password you were given at signup, and resetting without those leaves you offline until you can find them.
Why does my phone say connected with no internet?
The phone has a working link to the router but cannot reach the wider internet. Usually DNS, an address conflict, or a problem beyond the router entirely.
Should I change my DNS server?
It is worth trying as a diagnostic, and many people keep a public resolver permanently because it is faster and more reliable than some provider defaults. It is a safe change and easy to undo.
Why does restarting the router fix it so often?
Routers run continuously for months and accumulate stale state: exhausted address pools, stuck connection tables, memory leaks. A restart clears all of it at once.
How do I know if it is my provider's fault?
Connect a computer directly to the modem. If there is still no internet with the router out of the picture, the fault is the line or the modem, and that is your provider’s side.
Can too many devices cause this?
Yes. Routers hand out a limited pool of addresses, and when the pool is exhausted new devices connect to Wi-Fi but receive nothing usable. Restarting the router frees the pool.
The bottom line
Test a second device first, because it tells you immediately whether you are fixing a device or a network. For one device, forget the network and change DNS. For the whole house, read the modem lights before you restart anything, then restart modem and router in order. Check for a provider outage early, because it costs nothing and explains a lot of these.
