Well, it means that the machine you are attmpting to connect from is not allowed to do so. It is either locked out in the hosts table, or the user in whose name you attempt to connect has a machine name specified – the latter is more likely. You need to set up an account in the form of my_username@my_machine where my_machine is either the complete name of your computer or its IP address (given it is fixed…) or just use '%' instead of my_machine thus allowing my_username to connect from any hosts.