FB1 was sitting at login so it seems like it hasn't been opened up since its last restart. SSHD was not running (ps -elf |grep sshd returned nothing).

From /etc/init.d I ran:

sudo ./sshd start

sshing now works again, though we are still trying not to do it as per Rana's earlier post.

I also clicked the "DAQ RELOAD" button in the GDS TP medm screen, and the FB0 config light went from red to green.