NCC fatal errors

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?

As long as 139.196.203.180 is not your node, you have nothing to worry about. NIS is just telling you it can not connect to that other node.