Due to a power failure, my NAS device was powered down. When the connection failed, the icon used to represent the NAS changed.
Normally it looks like a rack-mounted XServe, but when the connection was lost it showed up as an old-school CRT monitor with a Windows blue screen of death (BSOD).
Here’s a screenshot:
This is how the NAS normally appears:
To see how to customize the icon used on Mac OS for a UPNP-advertised device, please read the earlier post: Using MDNS to advertise OpenSolaris NAS to Mac computers