🎮 Common Scenario: Are you experiencing Error 1921 while launching or installing Photoshop? The solutions below directly address the system interactions specific to this application.
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Download our advanced, custom-built Smart Diagnostic Script (.bat). It safely creates a System Restore Point, applies targeted fixes based on advanced diagnostics for Error 1921, and generates a detailed HTML repair report.
What is Error 1921?
Windows System Error Code 1921, known as ERROR_CANT_RESOLVE_FILENAME, is a RPC & Network error that occurs during Remote Procedure Call (RPC) and network communication. The error indicates that: The name of the file cannot be resolved by the system. When this error is encountered, the Windows operating system was unable to complete the requested operation within the network services subsystem. The error code 1921 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_CANT_RESOLVE_FILENAME 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 Remote Procedure Call (RPC) and network communication is essential for effective troubleshooting.
Common Causes
- RPC server is unavailable
- Network connectivity issues
- Firewall blocking required ports
- Remote endpoint timeout
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Read the full guide →Step-by-Step Solutions
- Open Command Prompt as Administrator
- Run: netsh winsock reset
- Run: netsh int ip reset
- Run: ipconfig /flushdns
- Restart your computer
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 "*1921*" -or $_.Message -like "*ERROR_CANT_RESOLVE_FILENAME*"} | Format-List💡 Open PowerShell as Administrator, paste the command above, and press Enter.
Prevention Tips
- Monitor network health regularly
- Document firewall rules
- Test connectivity after infrastructure changes