Forgotten the pw, think I know the user. Stupidly haven't updated the firmware/dashboard as there's a reset function with serial no. and contacting support.
I've contacted Dropbox support to see if there's anything they can do but wonder if anyone here might be able to help. I can still connect to the drobo and it logs in via finder (OS X Yosemite) and I think guest account is disabled (can't tell as can't log in) so I'm guessing the user/pw is stored somewhere - anyone got any ideas (other than don't be a dumb arse and forget my credentials)?