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.
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
Syntax error, command unrecognized. The server could not parse the command. This may also be sent when the command line is too long.
Quando você o vê
When you send a malformed or misspelled command, or a command the server does not recognize at all.
Como corrigir
Check the command spelling and syntax. Use HELP to see the list of supported commands on this server.
Diferenças principais
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.
Quando usar qual
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.