Why does my speed test show fast speeds but pages load slowly and downloads are slow?

This is almost always a DNS issue or browser-specific problem. Your speed test bypasses DNS and measures raw throughput, but web browsing requires DNS lookups for every domain. Change your DNS to 1.1.1.1 (Cloudflare) or 8.8.8.8 (Google) in your network adapter settings. Also clear your browser cache and disable any VPN or proxy. If only one browser is slow, reset that browser's settings.

Why am I connected to Wi-Fi but have no internet access?

The most common causes are: (1) your device got an invalid DHCP lease — fix with 'ipconfig /release' then 'ipconfig /renew' on Windows; (2) the router has internet access but a firewall rule is blocking your device; (3) the modem has lost its upstream connection — check modem status lights and reboot modem first, then router. On Android, go to Wi-Fi settings, forget the network, and reconnect. On iPhone, toggle Airplane Mode on and off.

Why is my 5 GHz Wi-Fi not working but 2.4 GHz is fine (or vice versa)?

If 5 GHz stops working: check the router admin page to confirm 5 GHz radio is enabled; move closer to the router since 5 GHz range is shorter; check if the router selected a DFS channel and switch to a non-DFS channel (36, 40, 44, 48, 149-165). If 2.4 GHz stops working: check for microwave or Bluetooth interference; ensure 2.4 GHz is enabled in the router settings (some routers default to 5 GHz only). On the client device, forget both networks and reconnect to the correct band.

My upload speed is very slow but download speed is fine — how do I fix it?

First check your ISP plan's upload cap — cable plans (Cox, Comcast, Spectrum) often cap upload at 10-35 Mbps. If you're below even that, check: (1) router QoS settings prioritizing download over upload; (2) a background application (cloud backup, torrent) consuming all upload bandwidth — check Task Manager Network tab; (3) half-duplex negotiation on Ethernet — set adapter to 'Auto Negotiation' or '1.0 Gbps Full Duplex' in Device Manager; (4) run 'ping 8.8.8.8 -n 100' and look for packet loss, which indicates upstream line issues requiring ISP support.

Why does my LG smart TV say 'Wi-Fi is turned off' and how do I turn it back on?

Go to Settings → All Settings → Network → Wi-Fi Connection and toggle it on. If grayed out, the TV's Quick Start+ feature sometimes disables Wi-Fi hardware on standby. Disable Quick Start+: Settings → All Settings → General → Quick Start+. Then fully power off the TV (hold power button 5 seconds until it restarts). If Wi-Fi still won't turn on, the Wi-Fi/Bluetooth module may have failed — use a wired Ethernet connection or an external USB Wi-Fi adapter as a workaround.

Down Speed & Wi-Fi Troubleshooting: Fix Slow Internet, 'Connected But No Internet', and Wi-Fi Not Connecting

Fix slow download speeds, 'connected but no internet', and Wi-Fi not connecting. Step-by-step commands and diagnostics for Windows, Mac, Android, and routers.

Last updated: February 27, 2026

Last verified: February 27, 2026

2,652 words

Key Takeaways

Root cause 1: IP address conflicts, stale DHCP leases, or DNS misconfiguration cause 'connected but no internet' and unidentified network errors.
Root cause 2: RF interference, channel congestion, outdated drivers, or ISP-side throttling cause slow download/upload speeds and poor Wi-Fi signal.
Root cause 3: Router firmware bugs, double-NAT, half-duplex mismatch on Ethernet, or faulty hardware cause intermittent drops and speeds far below your plan.
Quick fix summary: Release/renew IP, flush DNS, update Wi-Fi adapter drivers, change Wi-Fi channel, reboot modem then router in sequence, and run a wired speed test to isolate the problem layer.

Fix Approaches Compared
Method	When to Use	Time	Risk
Release & Renew IP + Flush DNS	Connected but no internet, unidentified network, DHCP errors	2 min	None
Change Wi-Fi Channel (2.4 GHz / 5 GHz)	Slow Wi-Fi, interference, 2.4 GHz working but 5 GHz not (or vice versa)	5 min	Low — brief disconnection
Update/Reinstall Wi-Fi Adapter Driver	Wi-Fi not showing up, adapter errors, Intel AC 9560/AX200 not working	10 min	Low — may require reboot
Power-cycle Modem then Router (sequence matters)	No internet after outage, ISP light errors, modem not connecting	3 min	None
Factory Reset Router	Persistent DNS issues, double NAT, corrupt config, mywifiext not working	15 min	Medium — loses all settings
Run Wired Ethernet Speed Test	Isolate whether slowness is Wi-Fi or ISP/modem layer	5 min	None
Change DNS to 8.8.8.8 / 1.1.1.1	Slow browsing, dns_probe_finished_nxdomain, pages load slow but speed test is fast	3 min	Low
QoS / Bandwidth Throttle Check	Upload speed slow, download fast, ISP throttling suspected	10 min	None

Understanding the Problem: Why Is My Internet Slow or Not Connecting?

When you see messages like 'Can't connect to this network', 'Wi-Fi connected, no internet access', 'Unidentified network', or you're simply getting download speeds far below what you pay for, the fault can sit at any of four layers:

Device layer — Wi-Fi adapter driver, IP stack corruption, or misconfigured DNS.
Router/access-point layer — Channel congestion, firmware bug, double-NAT, or overheating.
Modem layer — DHCP lease failure, upstream signal loss, or hardware fault.
ISP layer — Throttling, line degradation, regional outage, or provisioning mismatch.

The diagnostic strategy below moves from the device outward, so you spend your time fixing the most likely culprit first.

Step 1: Confirm Which Layer Is Broken

Run a wired speed test first. Plug an Ethernet cable directly from your modem (bypassing the router) into your computer and visit fast.com or speedtest.net. Compare the result to your plan speed.

Wired speed ≈ plan speed → problem is in your Wi-Fi or router.
Wired speed also slow → problem is your modem or ISP.
No IP address at all → DHCP or modem issue.

On Windows, open PowerShell as Administrator and run:

ipconfig /all
ping 8.8.8.8 -t
tracert 8.8.8.8

Look for Default Gateway in ipconfig output. If it shows 169.254.x.x (APIPA), your device never received a DHCP lease — the modem or router is not responding.

Step 2: Fix IP and DNS Issues on Windows

If you see 'Unidentified network', 'No internet access', or IPv4 connectivity: No network access, run the full IP stack reset:

# Run PowerShell or CMD as Administrator
netsh winsock reset
netsh int ip reset
ipconfig /release
ipconfig /flushdns
ipconfig /renew

Reboot after running these commands. This resolves the majority of 'connected but no internet' cases on Windows 10 and Windows 11.

For DNS-only slowness (pages load slowly but speed test is fast, dns_probe_finished_nxdomain), change your DNS:

Open Network & Internet Settings → Change adapter options → Right-click adapter → Properties → IPv4 → Use the following DNS
Set Preferred DNS: 1.1.1.1, Alternate: 8.8.8.8

Step 3: Fix Wi-Fi Adapter Driver Issues

Drivers are the most common cause of Intel AC 9560 not working, Intel AX200/AX201 not working, killer Wi-Fi 6 AX1650 not working, and similar errors. The symptom is often that Wi-Fi shows as available but cannot connect, or it connects but drops constantly.

On Windows:

Press Win + X → Device Manager → Network Adapters.
Right-click your Wi-Fi adapter → Update driver → Search automatically.
If that fails: right-click → Uninstall device → check 'Delete driver software' → reboot. Windows will reinstall a clean driver.
For Intel adapters, download the latest directly from Intel's driver page.

On macOS:

# Reset Wi-Fi on macOS
sudo ifconfig en0 down
sudo ifconfig en0 up
# If that doesn't help, remove saved Wi-Fi preferences:
sudo rm /Library/Preferences/SystemConfiguration/com.apple.wifi.plist
sudo rm /Library/Preferences/SystemConfiguration/NetworkInterfaces.plist

Reboot after removing the preference files.

Step 4: Fix Slow Wi-Fi — Channel Congestion and Band Issues

If your speed test over Wi-Fi is much lower than over Ethernet, the Wi-Fi radio is the bottleneck. Common causes:

Channel congestion: In dense apartment buildings, the 2.4 GHz band (channels 1, 6, 11) saturates quickly. Log in to your router admin page (typically 192.168.1.1 or 192.168.0.1) and change the 2.4 GHz channel. Use a Wi-Fi analyzer app (e.g., NetSpot on Mac/Windows, WiFi Analyzer on Android) to find the least-used channel.

2.4 GHz working but 5 GHz not (or vice versa): If your device can't connect to the 5 GHz band, check:

The device is within ~15 meters of the router (5 GHz has shorter range).
5 GHz is enabled in router settings — some ISP-provided routers ship with it disabled.
Your device supports Wi-Fi 5/6 — very old devices only support 2.4 GHz.
DFS channels: If your router auto-selected a DFS channel (52–144 on 5 GHz), some devices drop off during radar detection events. Manually set a non-DFS channel (36, 40, 44, 48, 149–165).

Router placement: Walls, microwaves, baby monitors, and Bluetooth devices all interfere with 2.4 GHz. Move the router to a central, elevated position.

Step 5: Fix Slow Upload Speed

Slow upload speed with normal download speed is often caused by:

Upload throttling by ISP (common on cable plans like Cox, Spectrum, Xfinity) — check your plan's advertised upload cap.
QoS misconfiguration — a router applying bandwidth limits to upstream traffic.
Half-duplex mismatch on Ethernet — if a device negotiates half-duplex instead of full-duplex, upload collisions cause severe slowdowns.

To check for duplex mismatch on Windows:

# Check current duplex setting
Get-NetAdapter | Select-Object Name, Speed, FullDuplex

If FullDuplex is False, open Device Manager → Network adapter → Properties → Advanced → find Speed & Duplex → set to 1.0 Gbps Full Duplex.

Step 6: Reboot Modem and Router in the Correct Sequence

A surprising number of 'no internet' issues resolve with a proper power-cycle sequence:

Unplug the modem (and router if separate) from power. Wait 60 seconds — not 10. This allows the modem's DHCP lease to fully expire upstream.
Plug in the modem only. Wait for all lights to stabilize (typically 90 seconds).
Plug in the router. Wait 60 seconds.
Reconnect your device.

This sequence fixes most Cox, CenturyLink, Frontier, Optimum, and Google Fiber 'no internet after outage' scenarios.

Step 7: Fix Double NAT

Double NAT (two devices both acting as routers/NAT gateways) causes game server connection failures, VPN issues, slow speeds, and port forwarding not working. You'll see it when ipconfig shows a 10.x.x.x or 192.168.x.x default gateway, and pinging that gateway reveals it's another NAT device behind the ISP modem-router.

Fix: Log in to your ISP's modem-router and enable Bridge Mode or IP Passthrough to let your own router handle NAT. Alternatively, disable the router function on your own router and use it only as an access point.

Step 8: ISP-Specific Checks

Cox slow internet / Cox panoramic Wi-Fi not working: Check Cox's outage map at cox.com/myaccount. If no outage, reboot the Panoramic modem by holding the reset button for 5 seconds (soft reset) or log in at 192.168.0.1. Cox upload speeds are often capped at 35 Mbps on older DOCSIS 3.0 plans — upgrade to DOCSIS 3.1 plan for higher upload.
CenturyLink / Quantum Fiber slow / can't connect to this network: Log in to 192.168.0.1, verify PPPoE credentials are correct. CenturyLink DSL is distance-sensitive — if you're far from the DSLAM, speeds will be lower than advertised.
Google Fiber slow: Gigabit speeds require a Gigabit-capable Ethernet adapter AND a Cat 5e/Cat 6 cable. USB 2.0 to Ethernet adapters cap at ~300 Mbps. Test with iperf3 to rule out the LAN.
AT&T Wi-Fi issues / BGW210 problems: Log in at 192.168.1.254. If using your own router, enable IP Passthrough to the router's MAC address to avoid double NAT.
Frontier restart router: Log in at 192.168.254.254 (Actiontec) or 192.168.1.1 (Arris). Use the admin reboot function rather than pulling power to avoid NVRAM corruption.

Step 9: Fixes for Smart TVs, Printers, and IoT Devices

LG TV says 'Wi-Fi is turned off': Go to Settings → All Settings → Network → Wi-Fi Connection and toggle Wi-Fi on. If the option is greyed out, perform a soft reset: Settings → Support → Self Diagnosis → Reset to Initial Settings. If the Wi-Fi module physically failed (common on older LG OLEDs), use a USB Wi-Fi adapter or Ethernet via the TV's LAN port.

HP printer says 'not connected to internet' / Canon printer won't connect to Wi-Fi: Most printer Wi-Fi issues are caused by connecting to the 5 GHz band — printers almost universally require 2.4 GHz. Ensure the printer is connecting to the 2.4 GHz SSID. After changing routers, run the printer's Wireless Setup Wizard from the control panel.

Alexa can't connect to Wi-Fi / having trouble connecting to internet: In the Alexa app, go to Devices → Echo & Alexa → [device] → Change Wi-Fi. Echo devices support only 2.4 GHz and 5 GHz WPA2 — they do not support WPA3 or 802.1X enterprise networks. If recently changed router password, you must reconfigure via the app.

Step 10: When Nothing Works — Advanced Diagnostics

# On Linux/macOS — full network diagnostic
ping -c 4 192.168.1.1          # Test gateway
ping -c 4 8.8.8.8              # Test internet IP (no DNS)
ping -c 4 google.com           # Test DNS resolution
traceroute google.com          # Find where packets stop
nslookup google.com 1.1.1.1   # Test alternate DNS
curl -o /dev/null -s -w "%{speed_download}" https://speed.cloudflare.com/__down?bytes=100000000

If ping 8.8.8.8 works but ping google.com fails, the issue is DNS-only. If ping 192.168.1.1 fails, the issue is between your device and router. If gateway pings fine but 8.8.8.8 fails, the issue is between your router and the internet (modem or ISP).

Frequently Asked Questions

bash

#!/usr/bin/env bash
# ============================================================
# Network Diagnostic Script
# Works on Linux and macOS. For Windows, see PowerShell block below.
# ============================================================

echo "=== Network Interface Info ==="
if command -v ip &>/dev/null; then
  ip addr show
else
  ifconfig
fi

echo ""
echo "=== Default Gateway ==="
if command -v ip &>/dev/null; then
  ip route show default
else
  netstat -rn | grep default
fi

GATEWAY=$(ip route show default 2>/dev/null | awk '/default/ {print $3}' | head -1)
if [ -z "$GATEWAY" ]; then
  GATEWAY=$(netstat -rn 2>/dev/null | grep default | awk '{print $2}' | head -1)
fi

echo ""
echo "=== Pinging Gateway ($GATEWAY) ==="
ping -c 4 "$GATEWAY"

echo ""
echo "=== Pinging 8.8.8.8 (Internet IP, no DNS) ==="
ping -c 4 8.8.8.8

echo ""
echo "=== Pinging google.com (DNS + Internet) ==="
ping -c 4 google.com

echo ""
echo "=== DNS Resolution Test ==="
nslookup google.com 1.1.1.1
nslookup google.com 8.8.8.8

echo ""
echo "=== Traceroute to 8.8.8.8 ==="
if command -v traceroute &>/dev/null; then
  traceroute -m 15 8.8.8.8
else
  tracepath -m 15 8.8.8.8
fi

echo ""
echo "=== Download Speed Test (requires curl) ==="
curl -o /dev/null -s -w "Download speed: %{speed_download} bytes/sec\nTime total: %{time_total}s\n" \
  https://speed.cloudflare.com/__down?bytes=25000000

echo ""
echo "=== Wi-Fi Signal Strength (Linux) ==="
if command -v iwconfig &>/dev/null; then
  iwconfig 2>/dev/null | grep -E 'Signal|Bit Rate|SSID'
fi

# ============================================================
# Windows PowerShell equivalent (run as Administrator):
# ============================================================
: <<'WIN_POWERSHELL'
# Run these in PowerShell (Admin):

# Full IP stack reset:
netsh winsock reset
netsh int ip reset
ipconfig /release
ipconfig /flushdns
ipconfig /renew

# Show all adapters:
Get-NetAdapter | Select-Object Name, Status, LinkSpeed, MacAddress

# Test connectivity layers:
Test-NetConnection -ComputerName 192.168.1.1 -InformationLevel Detailed
Test-NetConnection -ComputerName 8.8.8.8 -InformationLevel Detailed
Test-NetConnection -ComputerName google.com -Port 443 -InformationLevel Detailed

# Check for duplex mismatch:
Get-NetAdapter | Select-Object Name, Speed, FullDuplex

# Check current DNS:
Get-DnsClientServerAddress

# Set DNS to Cloudflare + Google (replace 'Wi-Fi' with your adapter name):
Set-DnsClientServerAddress -InterfaceAlias 'Wi-Fi' -ServerAddresses ('1.1.1.1','8.8.8.8')

# Measure download speed:
$url = 'https://speed.cloudflare.com/__down?bytes=25000000'
$start = Get-Date
Invoke-WebRequest -Uri $url -OutFile $null -UseBasicParsing
$elapsed = (Get-Date) - $start
Write-Host "Elapsed: $($elapsed.TotalSeconds)s | Approx speed: $([math]::Round(25/($elapsed.TotalSeconds),2)) MB/s"
WIN_POWERSHELL

echo "=== Diagnostic Complete ==="

Error Medic Editorial

The Error Medic Editorial team is composed of senior DevOps engineers, SREs, and network administrators with over a decade of experience diagnosing connectivity failures across enterprise and home networks. We specialize in translating complex TCP/IP and RF troubleshooting into actionable steps for every skill level.

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