When I'm trying to login remotely using SSH, it asks something like:
The authenticity of host '192.168.0.4 (192.168.0.4)' can't be established. ECDSA key fingerprint is 64:ec:a0:fa:bf:f0:65:a6:b2:af:90:f2:97:44:e4:3f. Are you sure you want to continue connecting (yes/no)?
What is that, and what can I do?