How to fix Error 570 on Windows 11

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Troubleshooting Guide: Error 570 (NtCreateFile API Failure) on Windows 11

Why This Error Happens

Error 570 is a placeholder status code used internally by the Windows LAN Manager (LanMan) Redirector when mapping low-level NTSTATUS codes to Win32 errors during network file operations. It typically surfaces when the NtCreateFile API call fails while accessing a remote file share, often due to a corrupted SMB session, a stale network redirector cache, or a mismatch between the client and server during file handle negotiation. In most cases, this indicates an internal error mapping failure rather than a genuine permissions issue, meaning the underlying problem lies in the network redirector layer rather than the application itself.

Step-by-Step Resolution Guide

  1. Restart the Workstation Service (which manages the LanMan Redirector):
  • Open PowerShell as Administrator and run:

    Restart-Service LanmanWorkstation -Force
  • This clears any corrupted session state without requiring a full reboot.
  1. Clear Cached SMB Connections:
  • Run the following command to remove stale drive mappings and cached credentials:

    net use * /delete /y
  • Re-map the network drive or reconnect to the share afterward.
  1. Flush DNS and Reset Network Stack (helps if the redirector is failing due to name resolution issues):
   ipconfig /flushdns
   netsh winsock reset
   netsh int ip reset
  • Restart the machine after running these commands.
  1. Check SMB Client/Server Configuration:
  • Ensure SMB signing and encryption settings match between client and server. Open PowerShell and run:

    Get-SmbClientConfiguration
    Get-SmbServerConfiguration
  • If there’s a mismatch (e.g., RequireSecuritySignature set differently on both ends), align the settings using Set-SmbClientConfiguration or Set-SmbServerConfiguration.
  1. Update Network Drivers and Windows:
  • Go to Settings > Windows Update > Check for updates, and also update NIC drivers via Device Manager > Network Adapters > Update Driver. Outdated SMB/NIC drivers are a common trigger for redirector mapping errors.

Alternative or Verification Steps

  • Verify the fix: Attempt the original file operation (e.g., opening/creating a file on the network share) and monitor Event Viewer under Windows Logs > System for recurrence of Error 570.
  • Alternative: If the issue persists, try accessing the share via its IP address instead of hostname (\\192.168.x.x\share) to rule out name resolution as the root cause, or temporarily disable third-party antivirus/firewall software that may be intercepting SMB traffic.