FTP 202 Command Superfluous vs 227 Entering Passive Mode
Both FTP 202 (Command Superfluous) and 227 (Entering Passive Mode) belong to the 2xx Positive Completion category. 202 indicates that the command is not implemented but is recognized as superfluous. The server acknowledges the command but it has no effect. Meanwhile, 227 means that entering Passive Mode. The server provides an IP address and port number for the client to connect to for data transfer, formatted as (h1,h2,h3,h4,p1,p2).
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
Entering Passive Mode. The server provides an IP address and port number for the client to connect to for data transfer, formatted as (h1,h2,h3,h4,p1,p2).
เมื่อคุณพบเห็น
After issuing the PASV command. The server switches to passive mode and tells the client where to connect for data transfer.
วิธีแก้ไข
No fix needed — parse the IP and port from the response to establish the data connection. If connections fail, check NAT/firewall rules on the passive port range.
ความแตกต่างหลัก
FTP 202: The command is not implemented but is recognized as superfluous. The server acknowledges the command but it has no effect.
FTP 227: Entering Passive Mode. The server provides an IP address and port number for the client to connect to for data transfer, formatted as (h1,h2,h3,h4,p1,p2).
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 227 when after issuing the PASV command. The server switches to passive mode and tells the client where to connect for data 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 227 (Entering Passive Mode): No fix needed — parse the IP and port from the response to establish the data connection. If connections fail, check NAT/firewall rules on the passive port range.