The remote server seems open to outsiders. Some people love open public NNTP servers to be able to read or post articles anonymously. Keep in mind that robots are harvesting such open servers on Internet, so you cannot hope that you will stay hidden for long. Unwanted connections could waste your bandwith or put you into legal trouble if outsiders use your server to read or post 'politically incorrects' articles. ** As it is very common to have IP based authentication, ** this might be a false positive if the OVS scanner is ** among the allowed source addresses.

Enforce authentication or filter connections from outside