FTP 220 Service Ready vs 225 Data Connection Open
Both FTP 220 (Service Ready) and 225 (Data Connection Open) belong to the 2xx Positive Completion category. 220 indicates that service ready for new user. This is the greeting message sent by the FTP server when a client first connects. Meanwhile, 225 means that data connection open; no transfer in progress. The data channel is established and ready but no file transfer has started yet.
Descrição
Service ready for new user. This is the greeting message sent by the FTP server when a client first connects.
Quando você o vê
Immediately upon connecting to an FTP server. This is the welcome banner confirming the server is accepting connections.
Como corrigir
No fix needed — the server is ready. Proceed with USER and PASS commands to authenticate.
Descrição
Data connection open; no transfer in progress. The data channel is established and ready but no file transfer has started yet.
Quando você o vê
When the data connection is established but idle, waiting for a transfer command to begin sending or receiving data.
Como corrigir
No fix needed — the data connection is ready. Issue a RETR, STOR, or LIST command to start using it.
Diferenças principais
FTP 220: Service ready for new user. This is the greeting message sent by the FTP server when a client first connects.
FTP 225: Data connection open; no transfer in progress. The data channel is established and ready but no file transfer has started yet.
You encounter 220 when immediately upon connecting to an FTP server. This is the welcome banner confirming the server is accepting connections.
You encounter 225 when when the data connection is established but idle, waiting for a transfer command to begin sending or receiving data.
Quando usar qual
For 220 (Service Ready): No fix needed — the server is ready. Proceed with USER and PASS commands to authenticate. For 225 (Data Connection Open): No fix needed — the data connection is ready. Issue a RETR, STOR, or LIST command to start using it.