MySQL client program MySQL Workbench 5.2 (no replies)

I am having a problem here with MySQL Workbench 5.2. I am able to connect to MySQL server on a Linux machine (Ubuntu) however the connection fails on Windows Vista and Windows 7 using exactly the same credentials (SSH private pey, passphrase, mysql port, user and password etc). I can't see any difference between the two. The error message says:

"lost connection to mysql server at waiting for initial communication packet system error 0"

Can someone please help?

Also I tried switching to another MySQL client program on Windows. Same problem, just wouldn't connect.