It means the FTP client created too many simultaneous connections to the FTP server, either reduce the number of threads the FTP client is using or increase the max connection limit on the FTP server.
Yep, it means your host only allows you have so many connections per your IP. What you can do, is reduce the number of connections in your FTP software.
i found the simple and easy solution is here: http://solewe.com/421-too-many-connections-8-from-this-ip-t584.html
i found the simple and easy solution is here: solewe.com/421-too-many-connections-8-from-this-ip-t584.html
Every Web hosting company blocking the FTP connection from the single ip address, if they cross the "Maximum number of simultaneous clients with the same IP address" limit, if they won't block the FTP connection then hackers, can easily hack the server. So its always better to support the web hosting companies policy, as they are trying to secure your valuable web hosting content which you have developed after a hard word. I would like to recommend you, disable the auto login feature as well as enable the passive port mode option n in the FTP client software, so that you won't face such problem in the future.