Sam can't connect with my raspberry

Hi, I try to install Snip on my raspberry pi. when I tried to connect sam to my pi, I receive some errors.
1.Error:
sam devices
Scanning devices on the network…
i No devices discovered
But I have already connect with the LAN cable and it doesn’t want to connect.

2.Error
If I use the commando Sam connect 123.456.7.89
? Enter username for the device: pi
? Enter password for the device: [hidden]

:heavy_multiplication_x: Error connecting to 123.456.7.89: Timed out while waiting for handshake
Error: Cannot parse privateKey: Unsupported key format”

Has someone an idea to fix this stuff?

I use Mac os X.

Thanks in advance!