how to get / download the config file from the server?

I know the config name, I know the server IP address but I cannot wget, nor tftp get it.

I was able to download the config files about 5 years ago, but I do not remember how I did that.
How the CM is download the config file?
I was tried to download both from windows cmd shell and linux shell.

tftp "config server IP" get config.cfg config2.cfg
not working.
also tried
wget ip/config.cfg
not working

How can I download the config file?

Is there any security filter to prevent downloading the config files from the server? But how the CM is downloading it?


Note: I have no working modded modem, so I can't download it via the modem using haxorware.