As of version 0.11 of the AstroBox software image, SSH access has been disabled by default. This was done following the security recommendations of the Raspberry Pi Foundation and in accordance with their own Raspbian builds.
If you need to (hopefully temporarily) enable SSH access to your unit, you can do this in two ways:
1) Using an external Monitor and Keyboard
Connect your Raspberry PI to an HDMI monitor and USB keyboard then reboot it.
If you have an AstroBox Touch you will see the AstroBox Touch logo. You need press CTRL+ALT+F1 in the keyboard to access the command line. The AstroBox Gateway will show the command line straight away. The default credentials to get in are:
username: pi
password: raspberry
Once inside, you can run the following commands:
sudo touch /boot/ssh sudo reboot
2) Accessing the SD Card
Open the SD card in a computer and place a file called 'ssh' into the root directory of the card. The file can be anything. You can even copy and rename one of the files already there.
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Once SSH is enabled, it will stay enabled. To disable it again run:
sudo update-rc.d ssh disable