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.
Mô tả
The command has been successfully executed. This is a general acknowledgment that the command was understood and carried out.
Khi bạn thấy mã này
After issuing any command that completes successfully, such as TYPE, MODE, or NOOP.
Cách khắc phục
No fix needed — the command succeeded. This is the standard positive response for commands that don't return data.
Mô tả
Connection closed; transfer aborted. The data connection was closed unexpectedly during a file transfer.
Khi bạn thấy mã này
When a file transfer is interrupted due to a network timeout, client disconnect, or the data connection dropping mid-transfer.
Cách khắc phục
Retry the transfer. If it keeps failing, check network stability, increase timeout values, and verify there are no firewalls killing idle connections.
Sự khác biệt chính
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.
Khi nào dùng cái nào
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.