FTP Error 451: Requested Action Aborted, Local Error
FTP reply code 451 indicates the server experienced an internal error that prevented it from completing the file operation. This is the FTP equivalent of an 'internal server error.' The error is on the server's side — disk I/O failures, filesystem corruption, out-of-memory conditions, or crashes in server-side processing hooks can all trigger 451. The client should treat this as a temporary failure and retry. If 451 persists, there is a systematic problem with the server that requires administrator intervention.
Status
451 Requested Action Aborted, Local ErrorExample
220 ftp.example.com FTP server ready
USER alice
331 Password required
PASS ****
230 User alice logged in
PASV
227 Entering Passive Mode (203,0,113,10,195,94)
RETR large_dataset.csv
150 Opening BINARY mode data connection
451 Requested action aborted. Local error in processingHow to Troubleshoot
Retry the operation
Wait a few minutes and retry. If the error was a transient disk or memory issue, it may resolve on its own.
Try a different file or operation
If the error occurs on a specific file, try accessing other files. If all operations return 451, the server has a systemic problem.
Contact the server administrator
If 451 persists after multiple retries, the server is experiencing hardware or configuration issues. Contact the administrator with the exact error message and timestamp.
Common Causes
Disk I/O error during file operation
highThe server encountered a read or write error on the disk while processing the file. This can be caused by bad sectors, failing drives, or filesystem corruption. The error may be intermittent.
Server-side processing hook failed
mediumSome FTP servers run hooks or scripts during file operations (antivirus scanning on upload, content filtering, quota checks). If the hook crashes or returns an error, the server aborts the operation with 451.
Out of memory or resource exhaustion
lowThe server process ran out of memory or hit an operating system resource limit while processing the command. This is temporary and may resolve once other operations complete and free resources.
Related Error Codes
Requested File Action Not Taken
The file operation was not completed because the file is temporarily unavailable.
Insufficient Storage Space
The server does not have enough disk space to complete the file operation.
Requested Action Not Taken, File Unavailable
The file or directory operation failed. The path does not exist, or access is denied.
References
| Specification | Section |
|---|---|
| RFC 959 | RFC 959 §4.2 |
Frequently Asked Questions
This reference was compiled from official RFCs, protocol specifications, and hands-on troubleshooting experience. AI tools were used primarily for formatting and organizing the content on the page.