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I agree with Corona688 100%. Go see the central computer. Start by logging in on the console (if the computer is up!) and work you way out in the direction of your problem computer.
As Corona688...

If arp -d had caused the problem, a reboot may have fixed it. Whatever custom ARP entries you deleted must have been in config files somewhere, or you'd need to type them in every boot. We have a...

Imho. The command "arp -d" did not cause this problem. The ARP table is only a cache.

Were you logged in at the time and suddenly got disconnected? What did you actually type in the minutes...

You may also be able to login to the console - the terminal that is physically connected to the sun box.

ARP ought to regenerate its own entries, and I'm not sure why it's not. If you use DHCP, try renewing your IP address, which might generate enough ARP traffic to let it know you exist again. Also...