Internet No Internet Access / No Internet Secured: Complete Troubleshooting Guide for Windows 10, Android, LG Smart TV & T-Mobile Home Internet

Understanding the 'No Internet Access' / 'No Internet Secured' Error

When Windows 10 displays the yellow exclamation mark and reports 'No Internet Access' or 'No Internet Secured', it means the Network Connectivity Status Indicator (NCSI) probe failed. Windows silently contacts http://www.msftconnecttest.com/connecttest.txt in the background. If that request does not return the expected string Microsoft Connect Test, the OS flags the connection as having no internet.

This probe failure can happen for many reasons:

• Your device obtained a 169.254.x.x (APIPA) self-assigned address because DHCP failed.
• Your DNS resolver is unreachable or returning NXDOMAIN for all queries.
• A firewall, VPN, or proxy is intercepting outbound HTTP/HTTPS.
• The TCP/IP or Winsock stack is corrupt.
• The ISP upstream link is down (visible on all devices).
• A device firmware bug (LG TV, Android) misreports captive portal state.

Step 1: Identify the Scope — One Device or All Devices?

Before touching any settings, answer this question: is every device on the network affected, or just one?

All devices affected → the problem is the router, modem, or ISP.

1. Check your ISP status page or app (T-Mobile Home Internet: use the T-Life app).
2. Power-cycle your modem and router: unplug power, wait 30 seconds, plug modem back in first, wait 60 seconds, then plug in the router.
3. Check the WAN/Internet LED on the router. Red or off = no upstream link.
4. If using T-Mobile Home Internet, move the gateway to a window with better 5G signal and allow 3 minutes to re-register.

Single device affected → the problem is device-specific. Continue with the steps below.

Step 2: Check Your IP Address

Windows 10

Open Command Prompt as Administrator and run:

ipconfig /all

Look at the IPv4 Address field for your WiFi adapter.

• 192.168.x.x or 10.x.x.x → valid DHCP address received; problem is DNS or routing.
• 169.254.x.x → APIPA address; DHCP failed. Release and renew:

ipconfig /release
ipconfig /renew

Android

Go to Settings → WiFi → (long press your network) → Manage Network Settings → Show Advanced Options. If the IP address is blank or 0.0.0.0, your device failed DHCP. Toggle Airplane Mode for 10 seconds, then reconnect.

LG Smart TV

Go to Settings → All Settings → Network → Wired/Wi-Fi Connection → Advanced Wi-Fi Settings. Check the IP address shown. If empty, select Set Automatically and reconnect.

Step 3: Test DNS Resolution

On Windows, open Command Prompt and run:

nslookup google.com
nslookup google.com 8.8.8.8

If the first command fails but the second succeeds, your assigned DNS server is the problem. Change DNS to 8.8.8.8 (Google) or 1.1.1.1 (Cloudflare):

1. Open Control Panel → Network and Internet → Network Connections.
2. Right-click your WiFi adapter → Properties.
3. Double-click Internet Protocol Version 4 (TCP/IPv4).
4. Select Use the following DNS server addresses.
5. Preferred: 8.8.8.8 | Alternate: 8.8.4.4. Click OK.

Step 4: Flush DNS and Reset the Network Stack (Windows 10)

This is the most effective fix for persistent 'internet no internet access' and 'internet not secured' errors on Windows 10. Run each command in an elevated Command Prompt (right-click → Run as Administrator):

ipconfig /flushdns
ipconfig /registerdns
netsh winsock reset
netsh int ip reset
nbtstat -R
nbtstat -RR

After these commands, restart your computer. Windows will rebuild the Winsock catalog and TCP/IP routing table from scratch.

Step 5: Fix 'Internet Not Secured' (Windows 10)

'Internet not secured' is a specific Windows 10 message meaning the connection is open (no WPA2/WPA3 encryption) OR Windows cannot validate the network's security certificate during NCSI. This is different from 'No Internet Access.'

Fixes:

1. Ensure your router uses WPA2-AES or WPA3 encryption, not WEP or open.
2. Forget the network and reconnect: Settings → Network & Internet → WiFi → Manage Known Networks → Forget → Reconnect.
3. Update your WiFi adapter driver: Device Manager → Network Adapters → right-click → Update Driver.
4. Set the correct date and time: An incorrect system clock causes TLS certificate validation failures, which Windows reports as 'not secured.'

Step 6: Android — 'Internet Not Available on WiFi'

Android uses its own captive portal detection by probing connectivitycheck.gstatic.com. If that probe fails (even though the internet works), Android marks the WiFi as 'Internet may not be available' and may prefer mobile data.

Fixes:

1. Toggle Airplane Mode for 10 seconds.
2. Forget and reconnect to the WiFi network.
3. Go to Settings → WiFi → (your network) → Forget, then reconnect.
4. Clear the Connectivity Service cache: Settings → Apps → Show System Apps → Connectivity Service → Clear Cache.
5. If behind a corporate proxy, the captive portal probe is blocked by design. Use a VPN or contact your network admin.
6. Change DNS on Android: Settings → Network & Internet → Private DNS → set to dns.google or one.one.one.one.

Step 7: LG Smart TV — 'Internet Not Working'

LG TV internet not working is commonly caused by outdated firmware, incorrect DNS, or a corrupted Smart Hub cache.

1. Check network connection: Settings → All Settings → Network → Network Connection Test. Note the exact step where it fails (Physical / IP address / Internet gateway / DNS / Internet access).
2. Change DNS on LG TV: Settings → All Settings → Network → Wi-Fi Connection → Advanced Wi-Fi Settings → DNS Server → enter 8.8.8.8.
3. Update firmware: Settings → All Settings → General → About This TV → Check for Updates. Keep the TV on during the update.
4. Reset Smart Hub: Settings → All Settings → General → System → Reset (or Smart Hub Reset). This clears cached credentials and app data.
5. Disable IPv6: Some LG TV models have IPv6 bugs. Settings → All Settings → Network → disable IPv6 if present.
6. Factory reset as last resort: Settings → All Settings → General → Reset to Initial Settings.

Step 8: T-Mobile Home Internet — No Internet

T-Mobile Home Internet uses a cellular gateway (Nokia, Arcadyan, or Sagemcom). Common causes of 'T-Mobile home internet no internet':

1. Gateway signal issue: Open the T-Life app → Internet → check signal bars. Move gateway near a window. The LED should be cyan (good) not red/flashing.
2. Gateway reboot: Hold the power button for 10 seconds or unplug for 30 seconds.
3. DHCP conflict: Connect a single device via Ethernet to isolate WiFi issues.
4. Band steering problems: Some older devices cannot connect to the combined 2.4/5 GHz SSID. Log into the gateway admin panel (192.168.12.1) and create separate SSIDs.
5. Outage: Check https://t-mobile.com/support/account/outage-information or Downdetector.

Step 9: Fix 'Internet No Upload Speed'

If downloads work but upload speed is near zero:

1. Run ping 8.8.8.8 -t (Windows) to check for packet loss during uploads.
2. Check for QoS settings on your router throttling upload bandwidth.
3. Test with a wired connection to rule out WiFi half-duplex issues.
4. Check if a background application (cloud backup, torrent client) is consuming all upload bandwidth using netstat -b (Windows) or nethogs (Linux).
5. Contact your ISP — upload throttling during congestion is a common ISP policy.