FTP 202 Command Superfluous vs 426 Connection Closed
FTP 202 (Command Superfluous) is a 2xx Positive Completion response, while 426 (Connection Closed) is a 4xx Transient Negative response. 202 indicates that the command is not implemented but is recognized as superfluous. The server acknowledges the command but it has no effect. In contrast, 426 means that connection closed; transfer aborted. The data connection was closed unexpectedly during a file transfer.
คำอธิบาย
The command is not implemented but is recognized as superfluous. The server acknowledges the command but it has no effect.
เมื่อคุณพบเห็น
When you send a command the server recognizes but considers unnecessary, such as ALLO on a server that does not require pre-allocation.
วิธีแก้ไข
No fix needed — the server is telling you the command is not necessary. You can safely ignore this response and continue.
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
202 is a 2xx Positive Completion response, while 426 is a 4xx Transient Negative response.
FTP 202: The command is not implemented but is recognized as superfluous. The server acknowledges the command but it has no effect.
FTP 426: Connection closed; transfer aborted. The data connection was closed unexpectedly during a file transfer.
You encounter 202 when when you send a command the server recognizes but considers unnecessary, such as ALLO on a server that does not require pre-allocation.
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 202 (Command Superfluous): No fix needed — the server is telling you the command is not necessary. You can safely ignore this response and continue. 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.