Local NIS or Remote NIS?
I guess it's a local one. I installed it via the standalone procedure.
Error: Time synchronization not possible, NIS not available. (org.nem.ncc.time.synchronization.NccTimeSynchronizer synchronizeTime)
Can you describe what exactly you did ? How did you run the software ?
I launched it as usual via 2 terminal windows:
sh nix.runNcc.sh and sh nix.runNis.sh (in the other window)
Does "sh nix.runNis.sh" give you any errors?
It seems like your NIS isn't running.