FTP 220 Service Ready vs 500 Syntax Error
FTP 220 (Service Ready) is a 2xx Positive Completion response, while 500 (Syntax Error) is a 5xx Permanent Negative response. 220 indicates that service ready for new user. This is the greeting message sent by the FTP server when a client first connects. In contrast, 500 means that syntax error, command unrecognized. The server could not parse the command. This may also be sent when the command line is too long.
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
Syntax error, command unrecognized. The server could not parse the command. This may also be sent when the command line is too long.
Когда вы это видите
When you send a malformed or misspelled command, or a command the server does not recognize at all.
Как исправить
Check the command spelling and syntax. Use HELP to see the list of supported commands on this server.
Ключевые различия
220 is a 2xx Positive Completion response, while 500 is a 5xx Permanent Negative response.
FTP 220: Service ready for new user. This is the greeting message sent by the FTP server when a client first connects.
FTP 500: Syntax error, command unrecognized. The server could not parse the command. This may also be sent when the command line is too long.
You encounter 220 when immediately upon connecting to an FTP server. This is the welcome banner confirming the server is accepting connections.
You encounter 500 when when you send a malformed or misspelled command, or a command the server does not recognize at all.
Когда что использовать
For 220 (Service Ready): No fix needed — the server is ready. Proceed with USER and PASS commands to authenticate. For 500 (Syntax Error): Check the command spelling and syntax. Use HELP to see the list of supported commands on this server.