⚠️ 2 verified solutions available for Error 4443 — Last updated 2026-03-31
Error 4443 📋

Fix ERROR_OFFLOAD_WRITE_FILE_NOT_SUPPORTED — Windows Error Code 4443

Error 4443 (ERROR_OFFLOAD_WRITE_FILE_NOT_SUPPORTED) is a Windows DNS & WINS error that occurs when the copy offload write operation is not supported for the file.. This guide provides step-by-step solutions to resolve this issue.

🏷️ Code: 4443 📛 ERROR_OFFLOAD_WRITE_FILE_NOT_SUPPORTED 📅 Updated: 2026-03-31 ⏱️ 2 Solutions
⚡ Quick Fix

Flush DNS and Switch Servers: Open Command Prompt as Administrator

👇 See all 2 solutions below
🐞 Auto-Fix Script for Error 4443
⚠️ How to use: Open PowerShell as Administrator, paste the code above, and press Enter.
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📑 Table of Contents
What is Error 4443? Common Causes Step-by-Step Solutions Prevention Tips Related Errors

💡 What is Error 4443?

Windows System Error Code 4443, known as ERROR_OFFLOAD_WRITE_FILE_NOT_SUPPORTED, is a DNS & WINS error that occurs during DNS resolution and WINS name resolution. The error indicates that: The copy offload write operation is not supported for the file. When this error is encountered, the Windows operating system was unable to complete the requested operation within the DNS/WINS services subsystem. The error code 4443 is returned by the GetLastError() function and provides developers with a specific identifier to diagnose the root cause of the failure. The symbolic name ERROR_OFFLOAD_WRITE_FILE_NOT_SUPPORTED maps directly to this numeric code and is commonly referenced in Microsoft documentation, developer forums, and system logs. Understanding this error and its context within DNS resolution and WINS name resolution is essential for effective troubleshooting.

⚠️ Common Causes

  • System resource conflict: The copy offload write operation is not supported for the file.
  • DNS server misconfigured
  • Stale DNS cache entries
  • Hostname cannot be resolved
📚 Comprehensive Guide

Fixing Permission Denied (0x80070005) and Access Violation Errors

An encyclopedia on Windows NT File System (NTFS) permissions, taking ownership via command line, and surviving 0x80070005 Access Denied errors.

Read the full guide →

✅ Step-by-Step Solutions

1 Flush DNS and Switch Servers
  1. Open Command Prompt as Administrator
  2. Run: ipconfig /flushdns
  3. Change DNS to Google (8.8.8.8) or Cloudflare (1.1.1.1)
  4. Run: ipconfig /registerdns
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Show Advanced Solutions (1 more)
2 Advanced Diagnostic for ERROR_OFFLOAD_WRITE_FILE_NOT_SUPPORTED
  1. Open Windows Event Viewer (eventvwr.msc)
  2. Navigate to Windows Logs → System to find Event ID 4443
  3. Look for associated warnings that occurred immediately before the system crashed
  4. Right-click the entry and export the log file for further analysis

🎬 Video Tutorials

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How to fix Error 4443 (Offload Write File Not Supported)
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💻 Diagnostic Command

Run this PowerShell command to find related events in your system log:

Get-EventLog -LogName System -Newest 20 | Where-Object {$_.Message -like "*4443*" -or $_.Message -like "*ERROR_OFFLOAD_WRITE_FILE_NOT_SUPPORTED*"} | Format-List

💡 Open PowerShell as Administrator, paste the command above, and press Enter.

🛡️ Prevention Tips

  • Use reliable DNS (8.8.8.8 or 1.1.1.1)
  • Flush DNS cache periodically
  • Monitor DNS resolution performance
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Last updated: 2026-03-31
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Based on Official Microsoft Documentation
Solutions Tested on Windows 10 & 11
Error codes sourced from Microsoft Win32 SDK. Updated 2026-03-31.
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