stealth mode attempts from DroboFS

I’m getting 100’s of these messages in my log:

9/9/11 9:11:12.482 PM Firewall: Stealth Mode connection attempt to TCP from

201 is the drobo, 14 is my mac. the mac port number accessed varies from 57563 to 57569. I found out that 548 is an afp port number. Is this something I should be concerned about? The droboFS never automatically mounts - I have to go through the manual mounting annoyance frequently.