FTP 200 Command OK vs 426 Connection Closed
FTP 200 (Command OK) is a 2xx Positive Completion response, while 426 (Connection Closed) is a 4xx Transient 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, 426 means that connection closed; transfer aborted. The data connection was closed unexpectedly during a file transfer.
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
Connection closed; transfer aborted. The data connection was closed unexpectedly during a file transfer.
เมื่อคุณพบเห็น
When a file transfer is interrupted due to a network timeout, client disconnect, or the data connection dropping mid-transfer.
วิธีแก้ไข
Retry the transfer. If it keeps failing, check network stability, increase timeout values, and verify there are no firewalls killing idle connections.
ความแตกต่างหลัก
200 is a 2xx Positive Completion response, while 426 is a 4xx Transient Negative response.
FTP 200: The command has been successfully executed. This is a general acknowledgment that the command was understood and carried out.
FTP 426: Connection closed; transfer aborted. The data connection was closed unexpectedly during a file transfer.
You encounter 200 when after issuing any command that completes successfully, such as TYPE, MODE, or NOOP.
You encounter 426 when when a file transfer is interrupted due to a network timeout, client disconnect, or the data connection dropping mid-transfer.
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 426 (Connection Closed): Retry the transfer. If it keeps failing, check network stability, increase timeout values, and verify there are no firewalls killing idle connections.