FTP 150 File Status OK vs 501 Syntax Error in Arguments
FTP 150 (File Status OK) is a 1xx Positive Preliminary response, while 501 (Syntax Error in Arguments) 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, 501 means that syntax error in parameters or arguments. The command was recognized but its arguments are invalid or malformed.
説明
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.
このコードが表示される場合
Right before a file download or upload begins, confirming the file is accessible and the data channel is being opened.
解決方法
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.
説明
Syntax error in parameters or arguments. The command was recognized but its arguments are invalid or malformed.
このコードが表示される場合
When you use a valid command but with wrong parameters, such as an invalid path format or incorrect argument count.
解決方法
Review the command's required argument format. Common issues include missing quotes around paths with spaces or invalid character encoding.
主な違い
150 is a 1xx Positive Preliminary response, while 501 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 501: Syntax error in parameters or arguments. The command was recognized but its arguments are invalid or malformed.
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 501 when when you use a valid command but with wrong parameters, such as an invalid path format or incorrect argument count.
どちらをいつ使うか
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 501 (Syntax Error in Arguments): Review the command's required argument format. Common issues include missing quotes around paths with spaces or invalid character encoding.