Wi-Fi and internet problems
Most connection problems come down to one of three things: the adapter, the router's channel, or DNS. Start with the guide that matches what you see, and reset the network stack only when nothing else helps.
- Discover Every Device on Your LAN with ARP
- Choose the Right Wi-Fi Channel and Width
- Test and Fix Bufferbloat on Your Home Connection
- Reset the Network Stack When Wi-Fi Misbehaves
- Fix Windows 11 Wi-Fi Connected but No Internet Access
- Configure Jumbo Frames Without Breaking the Network
- Capture Network Traffic with the Built-in pktmon Tool
- Map a Network Drive That Survives a Reboot
- Add a Persistent Route to a Second Network
- Reset a Broken System Proxy and WinHTTP Settings
- Set a Static IP Address and a Fixed DNS Server
- Back Up and Restore Your Wi-Fi Profiles Before a Reinstall
- Turn On DNS over HTTPS in Windows 11
- Set the Wi-Fi Connection Priority Order
- Fix DNS Lookups That Fail or Return Wrong Results
- Harden Your Home Router Before Someone Else Does
- Wake a PC Remotely With Wake-on-LAN
- Turn Off SMB1 and Require Signing on Your LAN
- Map a Network Drive That Reconnects After Every Reboot
- Block an App From the Internet With an Outbound Firewall Rule
- Stop Delivery Optimization From Saturating Your Network
- Open a Port for a LAN Game Server in Windows Firewall
- Set Up Remote Desktop Securely on Your Own LAN
- Record With ASIO for Low-Latency Monitoring
- Fix Bluetooth Audio Cutting Out When Wi-Fi Is Busy
- Set Up a Network Printer on a Fixed IP Address
- Measure Real LAN Throughput Between Two PCs With iperf3
- Share a Folder on Your LAN With SMB and Correct Permissions
- Cap Your Frame Rate Just Below Your Refresh Rate for Lower Latency
- Fix a Gigabit Connection That Runs at 100 Mbps
- Share Your Connection with the Mobile Hotspot
- Block an App's Internet Access With Windows Firewall
- Enable Encrypted DNS Over HTTPS on Windows 11
- Help Someone Remotely with Quick Assist
- Export and Restore Your Windows Firewall Rules
- Find What Is Using a Port and Free It
- Limit One App's Bandwidth with Policy-Based QoS
- Find Out Why SMB File Copies Are Slow
- Connect to a VPN With the Built-In Windows Client
- Block Ads System-Wide With the Hosts File
- Reduce Controller Input Lag on a Windows PC
- Set Up a High-Polling-Rate Mouse Correctly on Windows 11
- Cut Emulator Input Lag in RetroArch With Run-Ahead
Error codes
- DNS_PROBE_FINISHED_NXDOMAIN Site address could not be found
- ERR_CONNECTION_TIMED_OUT The site took too long to respond
- ERR_CONNECTION_REFUSED The site refused to connect
- NET::ERR_CERT_DATE_INVALID Your connection is not private
- No valid IP configuration Ethernet or Wi-Fi doesn't have a valid IP configuration
- DNS_PROBE_FINISHED_NO_INTERNET No internet
- ERR_INTERNET_DISCONNECTED You are offline
- ERR_NETWORK_CHANGED A network change was detected
- ERR_CONNECTION_RESET The connection was reset
- ERR_SSL_PROTOCOL_ERROR This site can't provide a secure connection
- ERR_TOO_MANY_REDIRECTS This page redirected you too many times
- Can't connect to this network Wi-Fi refuses to connect