When you install S7 miner without a firewall, router or something you should at least:
1. Change the UI password
2. Change the ssh password
3. Prohibit access to cgminers API (! this will keep out btcpool.loredo.tv or any other hack)
1. Change the UI password

2. Change the ssh password
Connect to S7 using ssh (default pass will be
admin or
root ):
ssh root@IP_OF_THE_MINER
Then type:
passwd
Now enter you new ssh password
3. Prohibit access to cgminers API
from ssh command line type:
vi /config/cgminer.conf
Modify line (press
i to enable modification in vi ):
"api-allow" : "W:0/0" to
"api-allow" : "W:127.0.0.1"
(press ESC then :x to save the changes)
Then go back to UI and
reboot the miner.