FTP 120 Service Ready Soon vs 125 Data Connection Open
Both FTP 120 (Service Ready Soon) and 125 (Data Connection Open) belong to the 1xx Positive Preliminary category. 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. Meanwhile, 125 means that the data connection is already open and the transfer is beginning. No need to open a new data connection.
Descripción
The service will be ready in a certain number of minutes. The server is not yet available but expects to be shortly.
Cuándo lo verás
When connecting to an FTP server that is starting up or temporarily busy with maintenance tasks.
Cómo solucionarlo
Wait the indicated number of minutes and try connecting again. If the server never becomes ready, contact the server administrator.
Descripción
The data connection is already open and the transfer is beginning. No need to open a new data connection.
Cuándo lo verás
When the server reuses an existing data connection for a file transfer instead of opening a new one.
Cómo solucionarlo
No fix needed — the transfer is starting immediately. Your client should begin reading or writing data on the existing connection.
Diferencias clave
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 125: The data connection is already open and the transfer is beginning. No need to open a new data connection.
You encounter 120 when when connecting to an FTP server that is starting up or temporarily busy with maintenance tasks.
You encounter 125 when when the server reuses an existing data connection for a file transfer instead of opening a new one.
Cuándo usar cada uno
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 125 (Data Connection Open): No fix needed — the transfer is starting immediately. Your client should begin reading or writing data on the existing connection.