FTP 120 Service Ready Soon vs 228 Entering Long Passive Mode
FTP 120 (Service Ready Soon) is a 1xx Positive Preliminary response, while 228 (Entering Long Passive Mode) is a 2xx Positive Completion response. 120 indicates that the service will be ready in a certain number of minutes. The server is not yet available but expects to be shortly. In contrast, 228 means that entering Long Passive Mode. An extended version of passive mode that supports longer addresses, including IPv6. Largely superseded by EPSV (229).
描述
The service will be ready in a certain number of minutes. The server is not yet available but expects to be shortly.
何时出现
When connecting to an FTP server that is starting up or temporarily busy with maintenance tasks.
如何修复
Wait the indicated number of minutes and try connecting again. If the server never becomes ready, contact the server administrator.
描述
Entering Long Passive Mode. An extended version of passive mode that supports longer addresses, including IPv6. Largely superseded by EPSV (229).
何时出现
After issuing the LPSV command on servers that support long addresses. Rarely seen in practice as EPSV is preferred.
如何修复
No fix needed, but consider using EPSV (Extended Passive Mode) instead, which is more widely supported and simpler to parse.
主要区别
120 is a 1xx Positive Preliminary response, while 228 is a 2xx Positive Completion response.
FTP 120: The service will be ready in a certain number of minutes. The server is not yet available but expects to be shortly.
FTP 228: Entering Long Passive Mode. An extended version of passive mode that supports longer addresses, including IPv6. Largely superseded by EPSV (229).
You encounter 120 when when connecting to an FTP server that is starting up or temporarily busy with maintenance tasks.
You encounter 228 when after issuing the LPSV command on servers that support long addresses. Rarely seen in practice as EPSV is preferred.
何时使用哪个
For 120 (Service Ready Soon): Wait the indicated number of minutes and try connecting again. If the server never becomes ready, contact the server administrator. For 228 (Entering Long Passive Mode): No fix needed, but consider using EPSV (Extended Passive Mode) instead, which is more widely supported and simpler to parse.