MySql Workbench - SSH login based management - Invalid Packet Blocking (no replies)

Hi All,

MySql Workbench returns "invalid packet blocking" when creating "New Server Instance Profile".
In the 4th step I selected
* "SSH login based management" radio button
* Operating System Linux
* MySql installation type: Ubuntu Linux (Vendor Package)

I tried to get connected to the server using other SSH apps:
* Putty 0.62: I get the error: "Incoming packet was garbled on decryption"
* CygWin: Bad packet length 375126642. Disconnecting: Packet corrupt

Additional Info:
OpenSSH_5.8p1, OpenSSL 1.0.0e
Ubuntu Server 11.10

Thanks,
Matteo.