DNS_PROBE_STARTED：意味と直し方を完全解説

# Flush the DNS resolver cache
ipconfig /flushdns

# Release and renew your IP address (resets DHCP)
ipconfig /release
ipconfig /renew

# Re-register DNS with your domain controller
ipconfig /registerdns

# Also flush Chrome's internal DNS cache:
# Open Chrome → navigate to chrome://net-internals/#dns → Click "Clear host cache"

# macOS Sonoma / Sequoia / Ventura (14+)
sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder

# macOS Monterey / Big Sur (12-13)
sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder

# Verify the flush worked — should return empty:
sudo dscacheutil -cachedump

# systemd-resolved (Ubuntu 18.04+, Fedora, Arch)
sudo systemd-resolve --flush-caches

# Verify: check cache size is 0
resolvectl statistics

# If using dnsmasq (older systems)
sudo systemctl restart dnsmasq

# If using nscd
sudo systemctl restart nscd

1. Open Chrome on Android
2. Type in the address bar: chrome://net-internals/#dns
3. Tap "Clear host cache"
4. Go to chrome://net-internals/#sockets
5. Tap "Flush socket pools"
6. Restart Chrome and try loading the website again

# Method 1: GUI
# Settings → Network & Internet → Wi-Fi (or Ethernet) → Hardware properties
# → DNS server assignment → Edit → Manual
# → IPv4: ON → Preferred: 1.1.1.1, Alternate: 1.0.0.1 → Save

# Method 2: PowerShell (as Administrator)
# Find your adapter name first:
Get-NetAdapter | Where-Object Status -eq Up

# Set DNS (replace "Wi-Fi" with your adapter name):
Set-DnsClientServerAddress -InterfaceAlias "Wi-Fi" -ServerAddresses 1.1.1.1,1.0.0.1

# GUI: System Settings → Network → Wi-Fi → Details → DNS
# Remove existing entries, add: 1.1.1.1 and 1.0.0.1

# Terminal (faster):
networksetup -setdnsservers Wi-Fi 1.1.1.1 1.0.0.1

# Verify:
networksetup -getdnsservers Wi-Fi
# Expected output:
# 1.1.1.1
# 1.0.0.1

# Check if the DNS Client service is running:
Get-Service Dnscache | Select-Object Name, Status, StartType

# Restart the DNS Client service:
Restart-Service Dnscache -Force

# Verify it's running:
Get-Service Dnscache
# Status should be "Running"

# Alternative: Services GUI
# Press Win+R → type services.msc → Enter
# Find "DNS Client" → Right-click → Restart

Step 1: Clear Chrome's DNS cache
  → Navigate to: chrome://net-internals/#dns
  → Click "Clear host cache"

Step 2: Flush socket pools
  → Navigate to: chrome://net-internals/#sockets
  → Click "Flush socket pools"

Step 3: Clear browsing data
  → Press Ctrl+Shift+Delete (Windows/Linux) or Cmd+Shift+Delete (Mac)
  → Time range: "All time"
  → Check: ✓ Cached images and files
  → Check: ✓ Cookies and other site data
  → Click "Delete data"

Step 4: Restart Chrome completely
  → Close all Chrome windows
  → Reopen Chrome and test

1. Open chrome://extensions/
2. Disable ALL extensions (toggle each one off)
3. Restart Chrome and test the website
4. If the error is gone, re-enable extensions one by one:
   → Enable one → test → if error returns, that's the culprit

Common culprits:
  • VPN browser extensions (NordVPN, ExpressVPN, Surfshark)
  • DNS-over-HTTPS extensions
  • Proxy/tunnel extensions (Hola, ZenMate)
  • Privacy extensions with custom DNS settings
  • Network debugging tools

# Reset Winsock catalog (fixes corrupted network socket entries)
netsh winsock reset

# Reset TCP/IP stack to factory defaults
netsh int ip reset

# Flush DNS cache
ipconfig /flushdns

# Release and renew DHCP lease
ipconfig /release
ipconfig /renew

# IMPORTANT: Restart your computer after running these commands
# The Winsock and TCP/IP resets require a reboot to take effect

# Remove network preferences (forces macOS to rebuild them)
sudo rm -f /Library/Preferences/SystemConfiguration/NetworkInterfaces.plist
sudo rm -f /Library/Preferences/SystemConfiguration/preferences.plist

# Restart mDNSResponder (DNS resolver)
sudo killall -HUP mDNSResponder

# Restart the network stack
sudo ifconfig en0 down && sudo ifconfig en0 up

# Restart your Mac for a clean state

# Check if Windows Firewall is blocking DNS (port 53)
Get-NetFirewallRule | Where-Object {
  $_.Direction -eq 'Outbound' -and $_.Action -eq 'Block'
} | Get-NetFirewallPortFilter | Where-Object {
  $_.RemotePort -eq 53
}

# If a blocking rule exists, allow DNS outbound:
New-NetFirewallRule -DisplayName "Allow DNS (UDP 53)" `
  -Direction Outbound -Protocol UDP -RemotePort 53 `
  -Action Allow -Profile Any

1. Unplug the router's power cable (not just press the button)
2. Wait 30 seconds (capacitors need time to discharge fully)
3. Plug the power cable back in
4. Wait 2-3 minutes for the router to fully boot
5. Reconnect to Wi-Fi and test

If you have a separate modem:
  → Unplug the modem first, wait 30s
  → Unplug the router, wait 30s
  → Plug modem back in first, wait 2 min
  → Plug router back in, wait 2 min

# Test your current DNS server
nslookup google.com
# If this times out → your DNS server is unreachable

# Test with Google DNS directly (bypasses your configured server)
nslookup google.com 8.8.8.8
# If this works → your default DNS server is the problem

# Test with Cloudflare DNS
nslookup google.com 1.1.1.1
# If this also fails → the problem is your network, not DNS servers

# Test basic internet connectivity (ping by IP — no DNS needed)
ping 1.1.1.1
# If this fails → you have no internet connection at all

# Test DNS resolution (ping by hostname — requires DNS)
ping google.com
# If IP ping works but hostname ping fails → DNS is the problem

# Check if port 53 (DNS) is reachable
# Windows:
Test-NetConnection 8.8.8.8 -Port 53
# macOS/Linux:
nc -zv 8.8.8.8 53

chrome://net-internals/#dns    → View cached DNS entries, clear cache
chrome://net-internals/#sockets → View active connections, flush pools
chrome://net-internals/#events  → Live event log (see DNS query lifecycle)
chrome://flags/#dns-over-https  → Check if Secure DNS is misconfigured
chrome://net-export/            → Export network log for deep analysis