The link just takes me to the nexus news page.
What does this mean and how do I stop it?
Mc1412013
(Mc1412013)
#2
It means your an evil hacker and that u were kicked for it.
Lol just kidding . It’s a well known issue that affects every one at some point. Just ignore it and restart game. It’s cause by by nexons anti cheat system crashing. There working on it but it it. It won’t ban u just piss u off. It will happen to u plenty of more times in the future
Kirays
#3
@Mc1412013 described it fairly well.
I just wanted to add:
If you experience this a lot then tell us what programs you are running in the background.
Sometimes NGS doesn’t like a specific one. 
Ardez1
(Ardez1)
#4
Usually related to an anti-virus or firewall. Suggest adding exceptions for DB in both and see if you still get the message as often.