Lost connection to MySQL server at 'reading initial communication packet', system error: 0 (no replies)

Hi, I have installed the latest version of MySQL Workbench on Ubuntu 14.10.

I'm trying to make a connection to a remote database requires public key and get the following error:

Failed to Connect to MySQL at xxxxxxxxx: 3306 xxxxxx-through SSH tunnel at 22 with User xxxxxx
Lost connection to MySQL server at 'reading initial communication packet', system error: 0

What could be going on ?.

Thanks and regards