NcFTPd general.cf file configuration
Don't forget to restart NcFTPd after modifying the general.cf file.
This option lets you set the size of the control connection's (session conversation with the remote user) socket receive buffer (using the SO_RCVBUF socket option). The value you specify should be in bytes, and must be a minimum of 512 bytes.
This requires the corresponding functionality to be implemented by the TCP/IP stack and may not be available on every operating system. You will almost never need to use this option, since the default setting works fine, but you can experiment with this to increase performance or conserve memory.
If memory conservation is the intention, you may want to use reduce-socket-buffer-memory instead, which sets this option for you.