Flush DNS and Switch Servers: Open Command Prompt as Administrator
👇 See all 2 solutions belowWhat is Error 4393?
Windows System Error Code 4393, known as ERROR_REPARSE_TAG_INVALID, is a DNS & WINS error that occurs during DNS resolution and WINS name resolution. The error indicates that: The tag present in the reparse point buffer is invalid. 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 4393 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_REPARSE_TAG_INVALID 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 tag present in the reparse point buffer is invalid.
- DNS server misconfigured
- Stale DNS cache entries
- Hostname cannot be resolved
Troubleshooting COM and DCOM Architectural Failures (Event ID 10016)
A comprehensive guide on Component Object Model (COM), Distributed COM (DCOM), and how to safely interpret and resolve Event ID 10016 errors.
Read the full guide →Step-by-Step Solutions
- Open Command Prompt as Administrator
- Run: ipconfig /flushdns
- Change DNS to Google (8.8.8.8) or Cloudflare (1.1.1.1)
- Run: ipconfig /registerdns
Video Tutorials
Diagnostic Command
Run this PowerShell command to find related events in your system log:
Get-EventLog -LogName System -Newest 20 | Where-Object {$_.Message -like "*4393*" -or $_.Message -like "*ERROR_REPARSE_TAG_INVALID*"} | 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