I have a home network on a Linksys 610N router, DroboFS, Windows 7 server, and a Macbook Pro laptop.
When I log into my Windows 7 server and start up DD, it sees the DroboFS and I am able to log in and make changes. Windows 7 can mount the volumes, etc.
If I turn on the MacBook Pro, either runing DD 1.6.8 or 1.7.1, DD just sits there waiting. If I got to Finder - Go - Connect To Server - I see the drobo and am able to mount it and access my files.
What am I missing? The only difference is that my Windows7 is connecting to the Drobo via gigabit ethernet, where my MacBook Pro is connected via wireless.