Greyed 'restart' button on iSCSI connection

Is this normal?
I’m having issues sharing the drobo over afp. Shares are setup, and used to work fine but randomly I’ve lost the Drobos shares listing on other computers. I’ve rebooted the computer and remade the shares with no luck.
Next plan is to reboot the Drobo but I can’t, so I need to shut it down and then physically start it back again. Not a normally a biggie but I put our Pro as far away from reach as possible.