FTP 125 Data Connection Open vs 200 Command OK
FTP 125 (Data Connection Open) is a 1xx Positive Preliminary response, while 200 (Command OK) is a 2xx Positive Completion response. 125 indicates that the data connection is already open and the transfer is beginning. No need to open a new data connection. In contrast, 200 means that the command has been successfully executed. This is a general acknowledgment that the command was understood and carried out.
คำอธิบาย
The data connection is already open and the transfer is beginning. No need to open a new data connection.
เมื่อคุณพบเห็น
When the server reuses an existing data connection for a file transfer instead of opening a new one.
วิธีแก้ไข
No fix needed — the transfer is starting immediately. Your client should begin reading or writing data on the existing connection.
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.
ความแตกต่างหลัก
125 is a 1xx Positive Preliminary response, while 200 is a 2xx Positive Completion response.
FTP 125: The data connection is already open and the transfer is beginning. No need to open a new data connection.
FTP 200: The command has been successfully executed. This is a general acknowledgment that the command was understood and carried out.
You encounter 125 when when the server reuses an existing data connection for a file transfer instead of opening a new one.
You encounter 200 when after issuing any command that completes successfully, such as TYPE, MODE, or NOOP.
ควรใช้อันไหนเมื่อไร
For 125 (Data Connection Open): No fix needed — the transfer is starting immediately. Your client should begin reading or writing data on the existing connection. For 200 (Command OK): No fix needed — the command succeeded. This is the standard positive response for commands that don't return data.