I'm using a new raspbian image (Jessie). I tried both lite and normal. Wifi connection is ok, I can browse the web and ping with no problems.

Starting an SSH connection (either from RPi3 to a Linux box or from the Linux Box to RPi3) starts ok. Connection is established, it asks for the user, then the password. After that it's stuck. The window is frozen and the prompt never appears.

Any ideas will be appreciated. Thanks!