The "421 - Too Many Connections" error typically occurs the FTP client is creating more than the allowed connections at a time.
The FTP server returns this error message to the client when the server's connection limit has been reached, and it cannot accept any more connections from clients.
There are several potential causes for this error:
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Server Configuration: The server's administrator might have set a maximum limit on the number of allowed connections to manage server resources effectively.
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High Traffic: The FTP server could be experiencing heavy traffic with clients trying to connect, leading to the connection limit being reached.
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Malicious Activity: In some cases, the server might be experiencing a denial-of-service (DoS) attack or excessive connection attempts from malicious sources, resulting in the connection limit being reached.
If you encounter the "421 - Too Many Connections" error, you can try the following:
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Wait and Retry: If the error is caused by a temporary overload, waiting for a few moments and then retrying the connection might work once the server's load reduces.
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Contact Server Administrator: If you are still facing the same issue contact our Support Team to check if there are connection limits and request an increase if needed.
Remember that FTP is an older and less secure protocol, and in modern environments, it is often recommended to use safer alternatives like SFTP (SSH File Transfer Protocol) or FTPS (FTP Secure), which provide encryption and better security.