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.
Описание
Service ready for new user. This is the greeting message sent by the FTP server when a client first connects.
Когда вы это видите
Immediately upon connecting to an FTP server. This is the welcome banner confirming the server is accepting connections.
Как исправить
No fix needed — the server is ready. Proceed with USER and PASS commands to authenticate.
Описание
Data connection open; no transfer in progress. The data channel is established and ready but no file transfer has started yet.
Когда вы это видите
When the data connection is established but idle, waiting for a transfer command to begin sending or receiving data.
Как исправить
No fix needed — the data connection is ready. Issue a RETR, STOR, or LIST command to start using it.
Ключевые различия
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.
Когда что использовать
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.