FTP 150 File Status OK vs 553 File Name Not Allowed
FTP 150 (File Status OK) is a 1xx Positive Preliminary response, while 553 (File Name Not Allowed) is a 5xx Permanent Negative response. 150 indicates that the file status is okay and the server is about to open the data connection for the transfer. This is the normal precursor to a file transfer. In contrast, 553 means that requested action not taken. File name not allowed. The file or directory name violates the server's naming rules or filesystem restrictions.
Descripción
The file status is okay and the server is about to open the data connection for the transfer. This is the normal precursor to a file transfer.
Cuándo lo verás
Right before a file download or upload begins, confirming the file is accessible and the data channel is being opened.
Cómo solucionarlo
No fix needed — this means the transfer is about to start. If the transfer stalls after this reply, check firewall rules blocking the data connection.
Descripción
Requested action not taken. File name not allowed. The file or directory name violates the server's naming rules or filesystem restrictions.
Cuándo lo verás
When you try to create or rename a file with characters the server's filesystem does not allow, such as special characters or reserved names.
Cómo solucionarlo
Rename the file to use only allowed characters. Avoid special characters like ?, *, |, <, >, and leading/trailing spaces or dots.
Diferencias clave
150 is a 1xx Positive Preliminary response, while 553 is a 5xx Permanent Negative response.
FTP 150: The file status is okay and the server is about to open the data connection for the transfer. This is the normal precursor to a file transfer.
FTP 553: Requested action not taken. File name not allowed. The file or directory name violates the server's naming rules or filesystem restrictions.
You encounter 150 when right before a file download or upload begins, confirming the file is accessible and the data channel is being opened.
You encounter 553 when when you try to create or rename a file with characters the server's filesystem does not allow, such as special characters or reserved names.
Cuándo usar cada uno
For 150 (File Status OK): No fix needed — this means the transfer is about to start. If the transfer stalls after this reply, check firewall rules blocking the data connection. For 553 (File Name Not Allowed): Rename the file to use only allowed characters. Avoid special characters like ?, *, |, <, >, and leading/trailing spaces or dots.