Fix WiFi, DNS, Winsock, Proxy, DHCP & more — automatically. No installation. 64 KB. Instant.
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NetFixer is a free, portable Windows tool that automatically diagnoses and repairs internet connection problems on Windows 10 and Windows 11. If your WiFi is connected but there's no internet, DNS isn't resolving, your IP address shows 169.254.x.x, websites won't load, or your network randomly drops — NetFixer finds the root cause and fixes it in seconds.
No installation. No bloatware. Just a single 64 KB EXE that runs instantly on any Windows 10/11 PC.
If you're experiencing any of the following on Windows 10 or Windows 11 — NetFixer will diagnose and fix it automatically:
- ❌ WiFi connected but no internet access
- ❌ DNS server not responding / DNS resolution failing
- ❌ IP address showing 169.254.x.x (APIPA / DHCP failure)
- ❌ Internet randomly disconnects and reconnects
- ❌ Websites not loading but ping works
- ❌ USB tethering overrides WiFi and breaks routing
- ❌ Slow internet after Windows Update
- ❌ Winsock corruption /
netsh winsock resetneeded - ❌ Proxy settings blocking internet access
- ❌ Avast / antivirus blocking DNS queries
- ❌ WiFi keeps disconnecting on battery
- ❌ Wi-Fi Direct adapter causing NDIS conflicts
- ❌ No internet after VPN disconnect
| Feature | NetFixer | Manual CMD Fix | Other Tools |
|---|---|---|---|
| No installation | ✅ | ✅ | ❌ Usually requires install |
| File size | 64 KB | N/A | 10–200 MB |
| Startup time | < 1 second | N/A | Several seconds |
| Auto-fix with one click | ✅ | ❌ Manual commands | |
| 10 checks in one scan | ✅ | ❌ One at a time | |
| Works offline | ✅ | ✅ | ❌ Often requires internet |
| Premium UI | ✅ Dark WPF | ❌ CMD window | |
| Free & open source | ✅ MIT | ✅ | ❌ Often paid |
| # | Problem Detected | How It's Fixed |
|---|---|---|
| 1 | WiFi Adapter Down — adapter disabled or no IP/gateway | Re-enables adapter, reports link speed |
| 2 | DHCP Failure — IP shows 169.254.x.x (APIPA address) | ipconfig /release then /renew |
| 3 | Wrong Routing Priority — USB tethering metric beats WiFi | Sets WiFi metric=10, USB=100, disables AutomaticMetric |
| 4 | WiFi Power Saving — adapter turns off on battery | Sets Maximum Performance power plan via powercfg |
| 5 | Wi-Fi Direct Conflict — virtual adapter causing NDIS Event 74 | Disables all Wi-Fi Direct virtual adapters |
| 6 | DNS Not Resolving — google.com lookup fails or times out |
Sets Google public DNS: 8.8.8.8 / 8.8.4.4 |
| 7 | Proxy Misconfigured — system proxy set but unreachable | Disables proxy in registry, resets WinHTTP |
| 8 | No Internet Reachability — ping and HTTPS both fail | Full network stack reset (winsock + ip + flush) |
| 9 | Winsock Corrupted — catalog has fewer than 10 entries | netsh winsock reset + netsh int ip reset |
| 10 | Antivirus DNS Block — Avast Web Shield causing DNS timeouts | Flush DNS cache, restart DNS Client service |
- Download
NetFixer.exeabove - Right-click → Run as administrator (or Windows will auto-prompt)
- Click ⚡ Scan Network
- Click Fix All Issues
- Done — your network issues are resolved
Works on: Windows 10 (all versions) · Windows 11 · x64
[Scan Network]
│
├─► Check WiFi Adapter ──────────► PASS / FAIL + auto-fix available
├─► Check DHCP Lease ────────────► PASS / FAIL + auto-fix available
├─► Check Interface Metric ──────► PASS / WARN + auto-fix available
├─► Check WiFi Power Saving ─────► PASS / WARN + auto-fix available
├─► Check Wi-Fi Direct Adapter ──► PASS / WARN + auto-fix available
├─► Check DNS Resolution ────────► PASS / FAIL + auto-fix available
├─► Check Proxy Settings ────────► PASS / FAIL + auto-fix available
├─► Check Internet Reachability ─► PASS / FAIL + auto-fix available
├─► Check Winsock Integrity ─────► PASS / FAIL + auto-fix available
└─► Check Antivirus Interference ► PASS / WARN + auto-fix available
│
[Fix All Issues] ──► Applies all available fixes sequentially
git clone https://github.com/D13056/NetFixer.git
cd NetFixer
dotnet build -c Release
# Output: bin\Release\net48\NetFixer.exe (~64 KB)Requirements to build: .NET 8 SDK · Windows 10/11 x64
Requirements to run: Windows 10/11 with .NET Framework 4.8 (pre-installed on all modern Windows — no download needed)
| OS | Windows 10 / Windows 11 (x64) |
| Runtime | .NET Framework 4.8 — already installed on Windows 10 v1903+ and all Windows 11 |
| Privileges | Administrator — auto-requested via UAC on launch |
| Disk space | 64 KB |
| RAM | < 30 MB |
| Dependencies | None |
Q: Is NetFixer safe? Does it change system settings permanently?
A: Yes, it's safe and open source — you can read every line of code here. Most fixes (DNS, proxy, power saving) are fully reversible. Interface metric and winsock reset are permanent but standard Windows operations.
Q: Why does it need Administrator?
A: Fixing network adapters, routing tables, DNS settings, Winsock, and power plans all require elevated OS permissions. NetFixer requests this automatically via UAC.
Q: My WiFi shows "Connected" but I have no internet — will this fix it?
A: Yes. This is the most common scenario NetFixer is built for. It checks DHCP, DNS, routing, proxy, and internet reachability in sequence and fixes each layer.
Q: Does it work with Ethernet too?
A: The DNS, proxy, Winsock, and internet reachability checks work for all connection types. The WiFi-specific checks (power saving, Wi-Fi Direct) are WiFi-only.
Q: Will it break anything?
A: No. All fixes are standard Windows recovery operations (the same ones Microsoft's own troubleshooter performs). Winsock and IP resets require a reboot to fully take effect.
Q: Does it work on Windows 7/8?
A: NetFixer targets Windows 10/11 with .NET Framework 4.8. It may run on Windows 8.1 with .NET 4.8 installed but is not tested.
Q: Is it really only 64 KB?
A: Yes. By targeting .NET Framework 4.8 (which is pre-installed on all Windows 10/11 machines), there's no runtime to bundle. The EXE contains only the app's own code.
- Avast check — only triggers if Avast service is running AND DNS timeout events exist in the last 24 hours (prevents false positives from old logs)
- Winsock / IP reset — requires reboot to fully apply; NetFixer will inform you
- Wi-Fi Direct — fix disables adapter at OS level; re-enable via Device Manager if a Wi-Fi Direct feature stops working
Contributions are welcome! See CONTRIBUTING.md for guidelines.
Ideas for new checks:
- IPv6 connectivity test
- MTU / packet fragmentation detection
- VPN adapter conflict detection
- Windows Firewall rules inspection
- Network driver version check
NetFixer/
├── app.manifest # UAC requireAdministrator
├── NetFixer.csproj # .NET Framework 4.8 WPF project
├── App.xaml / App.xaml.cs # Application entry point
├── MainWindow.xaml # Premium dark WPF UI
├── MainWindow.xaml.cs # Code-behind + 5 value converters
├── NetworkDiagnostics.cs # 10 diagnostic checks + auto-fix engine
└── screenshots/
├── main_window.png
└── after_scan.png
If NetFixer fixed your internet problem, please star this repository — it helps others find it when they search for Windows network repair tools.
NetFixer is free and will always be free. If it saved your day, consider buying me a coffee!
MIT License — free to use, modify, and redistribute. See LICENSE.
NetFixer — Windows Network Repair Tool · C# WPF · .NET Framework 4.8 · Free & Open Source
Fix WiFi · Fix DNS · Fix Winsock · Fix DHCP · Fix Proxy · Fix Routing — all in one click