I’m running NIS and NCC on a Linux laptop and I am getting these sort of messages printed to the NCC console in red color:
2017-07-01 17:28:43.912 SEVERE INDIRECT fatal error encountered while communicating with <Node [NBBYB6RJFFTHMRT3CNJBNWT2SSS2ANOWEOEPONAJ ] @ [139.196.203.180]>: java.util.concurrent.CompletionException: org.nem.peer.node.ImpersonatingPeerException: entity source cannot be verified (org.nem.peer.services.NodeRefresher a)
Is this something to be concerned about?