FTP 200 Command OK vs 550 File Unavailable
FTP 200 (Command OK) is a 2xx Positive Completion response, while 550 (File Unavailable) is a 5xx Permanent Negative response. 200 indicates that the command has been successfully executed. This is a general acknowledgment that the command was understood and carried out. In contrast, 550 means that requested action not taken. File unavailable — the file does not exist, the path is wrong, or you do not have permission to access it.
คำอธิบาย
The command has been successfully executed. This is a general acknowledgment that the command was understood and carried out.
เมื่อคุณพบเห็น
After issuing any command that completes successfully, such as TYPE, MODE, or NOOP.
วิธีแก้ไข
No fix needed — the command succeeded. This is the standard positive response for commands that don't return data.
คำอธิบาย
Requested action not taken. File unavailable — the file does not exist, the path is wrong, or you do not have permission to access it.
เมื่อคุณพบเห็น
When you try to download, delete, or navigate to a file or directory that does not exist or is restricted by server permissions.
วิธีแก้ไข
Verify the file path and name are correct (FTP paths are case-sensitive on most servers). Check your user permissions with the server administrator.
ความแตกต่างหลัก
200 is a 2xx Positive Completion response, while 550 is a 5xx Permanent Negative response.
FTP 200: The command has been successfully executed. This is a general acknowledgment that the command was understood and carried out.
FTP 550: Requested action not taken. File unavailable — the file does not exist, the path is wrong, or you do not have permission to access it.
You encounter 200 when after issuing any command that completes successfully, such as TYPE, MODE, or NOOP.
You encounter 550 when when you try to download, delete, or navigate to a file or directory that does not exist or is restricted by server permissions.
ควรใช้อันไหนเมื่อไร
For 200 (Command OK): No fix needed — the command succeeded. This is the standard positive response for commands that don't return data. For 550 (File Unavailable): Verify the file path and name are correct (FTP paths are case-sensitive on most servers). Check your user permissions with the server administrator.