In this tutorial I will show you how to fix an error “421”: too many connections from this IP.
Client probably will get this error when connecting from FileZilla FTP client to his FTP account.
You can resolve this error by editing the FileZilla settings, follow the below steps:
File -> Site manager -> Transfer Settings -> check “Limit number of simultaneous connections” -> set it to “1”
You can also check the below settings in the ftp server configuration file:
# Maximum number of simultaneous users
# Maximum number of sim clients with the same IP address
If the FTP server is pure-ftp then the configuration file must be >> /etc/pure-ftpd.conf