On SPARC machines, disconnected network cabling also produces a series of no carrier messages.
On IA machines, the NIS+ messages might be the only indication that network cabling is disconnected.
If many NIS clients on the network are giving this message, go to the NIS server in question and reboot or repair as necessary. To locate the NIS server for a domain, run the ypwhich(1) command. When the server machine returns to operation, NIS clients give an NIS server for domain OK message.