Hi Jun,
Your PC must be connected to your PC via an ethernet connection, and it must be on the same subnet as the device in order for you to use ssh or scp. If you run “ifconfig eth0” on your Putty serial connection, you should see the device’s IP address. The default should be 192.168.2.1
You need to either move your PC to the subnet of the MTCDP or move the MTCDP to your PC’s subnet.
For example:
MTCDP ip = 192.168.2.1
PC ip = 192.168.50.155
Either the MTCDP must have a 192.168.50.xxx IP address, or your PC must have a 192.168.2.xxx IP address in order for them to find each other.
Cheers,
Mike