FTP Error 452: Insufficient Storage Space
FTP reply code 452 means the server cannot complete the requested action because there is not enough storage space. This typically occurs during file uploads (STOR, APPE) when the server's disk partition is full or the user's quota has been reached. Unlike 552 (permanent size-related rejection), 452 is temporary — the condition may change if files are deleted or quotas are reset. The server may also return 452 if the temporary space needed for file processing (such as antivirus scanning before moving the file to its final location) is insufficient.
Status
452 Insufficient Storage SpaceExample
220 ftp.example.com FTP server ready
USER alice
331 Password required
PASS ****
230 User alice logged in
PASV
227 Entering Passive Mode (203,0,113,10,195,95)
STOR video_export.mp4
150 Opening BINARY mode data connection
452 Insufficient storage space in systemHow to Troubleshoot
Check available disk space
If you have server access, check the disk usage on the FTP storage partition. Free space by removing old files, logs, or temporary data.
df -h /var/ftp
Delete unnecessary files from FTP
Use DELE to remove old or unnecessary files from your FTP directory to free up quota space. Use LIST to see file sizes and identify large files to remove.
Contact the administrator for quota increase
If you need more space than your quota allows, contact the server administrator to request a quota increase.
Upload a smaller file to test
Try uploading a very small test file (a few bytes). If this succeeds, the disk is not completely full but your specific file exceeds the remaining space.
Common Causes
Server disk partition full
highThe partition where the FTP files are stored has reached capacity. No new files can be written until space is freed. This affects all users on the server, not just the current session.
User quota exceeded
highThe FTP user has reached their configured storage quota. The user needs to delete files to free space, or an administrator needs to increase the quota.
Temporary directory full
lowThe server writes uploaded files to a temporary directory first (for scanning or atomic move operations). If the temp partition is full, uploads fail even if the destination has space.
Related Error Codes
Requested Action Aborted, Local Error
The server encountered an internal error while processing the command. The client should retry later.
Requested File Action Aborted, Storage Allocation Exceeded
The file operation was rejected because it exceeds the storage limit or allocation.
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.