DNS failure
The device or router may not be resolving website names correctly.
This guide helps you validate whether websites are failing because of DNS, browser cache, device settings, security software or a wider broadband problem.
DNS and browser troubleshooting
This guide helps you validate whether websites are failing because of DNS, browser cache, device settings, security software or a wider broadband problem.
Issue
Use these signs to confirm that this is the closest matching issue before changing settings, replacing equipment or contacting your provider.
Likely causes
The same symptom can have several different causes. Start with the causes below, then use the validation steps to prove which one is most likely.
The device or router may not be resolving website names correctly.
Cached data, extensions or security settings can block sites.
VPNs, parental controls and security tools can route or block traffic.
A stale IP lease or custom DNS/proxy setting can break browsing.
The problem may affect only certain sites or routes.
Validate
Work through these checks in order. Change one thing at a time so the result tells you something useful.
Try more than one website and one browser.
Test apps, streaming or email to see whether internet works outside the browser.
Try another device on the same Wi‑Fi.
Turn off VPN/proxy temporarily for testing.
Restart the device and router if multiple devices are affected.
Try mobile data to confirm whether the website itself is down.
Fix
Apply the fix that matches the cause you validated. If the issue is proven outside your home network, gather evidence before contacting your provider.
Clear cache or try a private window and disable browser extensions.
Forget and reconnect to Wi‑Fi or renew the network connection.
Remove custom proxy/VPN settings and check parental/security filters.
If browsing fails across devices while other services fail too, move to broadband-down troubleshooting.