ssh - Sublime SFTP tunneling -

to connect my_computer my_laptop @ work next thing:

1. ssh -xy <login>@<commonserver>
2. ssh <my_computer>
3. enter password

now, want edit files on my_computer my_laptop via sublime 2 , sftp plugin.

unfortunately next configuration doesn't work:

"host": "my_computer.commonserver" 

how can it? how should set-up sftp-server file?

additional question: there way set-up sftp-server file in way ignore welcoming message when log-in via ssh?