How to Fix Windows Sandbox No Internet or Network Not Working on Windows
Windows Sandbox has no internet connection, can't access network resources, or networking features broken inside the sandbox? Fix Sandbox networking.
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Main Troubleshooting Guide
How to Fix No Internet Connection →Complete symptoms, causes, and step-by-step solutions
Symptoms
You might be experiencing this problem if you notice:
- •Windows Sandbox shows "No Internet" — can't browse web
- •Sandbox can't reach internal network resources
- •DNS resolution fails inside the sandbox
- •Sandbox networking was working but stopped after update
- •VPN connection on host breaks Sandbox networking
- •Firewall rules blocking Sandbox network access
Common Causes
- ⚠Host network adapter sharing not working with Sandbox
- ⚠Hyper-V virtual switch misconfigured
- ⚠VPN software on host conflicts with Sandbox NAT
- ⚠Windows Firewall blocking Sandbox network traffic
- ⚠DNS settings not propagating to Sandbox
- ⚠Sandbox networking disabled in configuration file
Solutions
Solution 1: Fix Sandbox Network Adapter
- 1Sandbox uses a virtual NAT network from Hyper-V:
- 2Check: Device Manager → Network adapters → "Hyper-V Virtual Ethernet Adapter"
- 3If missing or has error: reset the virtual switch
- 4PowerShell as Admin: Get-VMSwitch → verify switches exist
- 5If broken: Disable and re-enable Windows Sandbox feature:
- 6Settings → Apps → Optional features → More Windows features
- 7Uncheck "Windows Sandbox" → restart → re-check → restart
Solution 2: Fix VPN Conflict
- 1VPN software often breaks Sandbox networking:
- 2Disconnect VPN → test Sandbox networking
- 3If it works without VPN: the VPN driver conflicts with Hyper-V NAT
- 4Workaround: use split tunnel VPN that doesn't capture all traffic
- 5Or: configure Sandbox WSB file to disable networking:
- 6<Configuration><Networking>Disable</Networking></Configuration>
- 7Then manually copy files in/out instead of downloading
Solution 3: Reset Hyper-V Networking
- 1PowerShell as Administrator:
- 2Get-VMSwitch | Remove-VMSwitch -Force
- 3This removes all virtual switches
- 4Restart Windows — Sandbox will recreate its switch on next launch
- 5If still broken: netcfg -d (resets all network components)
- 6WARNING: netcfg -d removes all network adapters — they reinstall on reboot
- 7Last resort: Disable Hyper-V feature, restart, re-enable, restart
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