How to fix ERROR_CLOUD_FILE_NETWORK_UNAVAILABLE (388)
Description
The cloud sync provider failed to perform the operation due to the network being unavailable. OneDrive attempted to access the internet to hydrate (download) an online-only file or complete a sync operation, but could not establish a connection to Microsoft's servers.
Causes
- The device is not connected to the internet or has a very weak/unstable connection.
- A VPN, proxy, or firewall is blocking OneDrive's access to Microsoft's cloud endpoints.
- DNS resolution is failing for OneDrive's servers.
- OneDrive is set to metered connection mode, which pauses syncing on cellular or limited networks.
- Windows reports network availability incorrectly after waking from sleep.
Solutions
Verify Internet Connectivity
Open a browser and confirm general internet access is working. Try navigating to onedrive.live.com to verify OneDrive's servers are reachable.
Reconnect to Your Network
Disconnect and reconnect your Wi-Fi or Ethernet connection. On Wi-Fi, try forgetting the network and reconnecting. If possible, test with a different network to rule out router or ISP issues.
Disable Metered Connection Setting
- Go to Settings > Network & Internet > Wi-Fi (or Ethernet).
- Click your connected network and ensure Set as metered connection is turned off.
- In OneDrive settings, check that syncing on metered connections is not disabled.
Check VPN and Firewall Settings
If you're connected to a VPN, try disconnecting temporarily and retesting. If a firewall or proxy is in use, ensure that onedrive.exe and Microsoft's OneDrive endpoints (*.onedrive.com, *.sharepoint.com) are on the allowed list.
Flush DNS and Reset Network Stack
Open Command Prompt as Administrator and run:
ipconfig /flushdns
netsh winsock reset
netsh int ip reset
Restart your PC after running these commands.
Re-enable OneDrive Sync
Click the OneDrive taskbar icon, open Help & Settings, and check whether syncing has been paused. Resume it if so.