1. Update Network and Redirector Drivers
- Press Win + X and select Device Manager
- Expand Network Adapters and right-click your active adapter
- Choose Update Driver → Search automatically
- Also run:
net stop mrxsmb
net start mrxsmb
via Command Prompt to restart the redirector service
2. Disable Security Software Temporarily
- Temporarily turn off your antivirus and firewall
- Retry accessing the shared folder or file
- If the BSOD stops, whitelist SMB-related ports
- If you're using enterprise firewall policies, check with your network admin for SMB configuration
3. Reset TCP/IP and Winsock Stack
- Open Command Prompt as administrator
- Run the following commands one by one:
netsh int ip reset
netsh winsock reset
ipconfig /flushdns
- Reboot the system after executing all commands
- This clears cached network configurations and helps resolve underlying communication issues
4. Verify File and Printer Sharing Settings
- Go to Control Panel → Network and Sharing Center → Advanced Sharing Settings
- Ensure File and printer sharing is turned on
- On the host machine, right-click the shared folder → Properties → Sharing tab → Advanced Sharing
- Confirm correct permissions are set and simultaneous access is allowed
5. Uninstall Problematic Windows Updates
- Go to Settings → Windows Update → Update History → Uninstall Updates
- Identify any recently installed updates just before the BSOD started
- Uninstall them, then restart the system
- You can also pause future updates to prevent recurrence until the root cause is resolved
6. Use System File Checker and DISM
- Open Command Prompt (Admin) and run:
sfc /scannow
- Follow up with:
DISM /Online /Cleanup-Image /RestoreHealth
- These commands repair or replace missing/corrupted system files that may affect SMB operations
7. Restore Network Defaults or Reconfigure Network
- Go to Settings → Network & Internet → Advanced Network Settings → Network Reset
- Click Reset now to restore default adapter settings
- Alternatively, assign static IPs and DNS to avoid name resolution issues that often affect SMB
Final Thoughts
The 0x00000043 SMB MiniRedirector BSOD often results from instability in the network file-sharing infrastructure, especially when the MiniRedirector fails to handle shared resource access properly.
To fix it:
- Update or reinstall redirector/network drivers,
- Reset your network settings and ensure SMB file sharing is configured correctly.
- And disable or adjust antivirus/firewall rules that may block SMB traffic.
If the issue persists:
- Use SFC and DISM to restore networking components.
- Reconfigure your sharing permissions or DNS settings,
- Or roll back recent updates to remove conflicts with SMB operations.
- Keeping drivers up to date and monitoring file-sharing behaviour across networks is key to avoiding future occurrences of this error.